Stefano Pioli's decision to employ a three-man defence in Sunday's 1-0 derby defeat to Inter erased years of good work with the Rossoneri, according to legendary former boss Arrigo Sacchi.
Lautaro Martinez's first-half goal condemned Milan to another chastening defeat at San Siro, meaning they have gone five league games without a win for the first time since 2018.
Last season's Scudetto winners have now lost four consecutive games in all competitions, and they sit 18 points adrift of runaway leaders Napoli after slumping to sixth place in Serie A.
Milan failed to attempt a single shot on target in the game after opting to match Inter's 3-5-2 system, and Sacchi says the Rossoneri no longer resemble a coherent side.
"Milan were no longer a team, especially in the first half. Inter did not play against an opponent, but against a sparring partner," he told La Gazzetta dello Sport on Monday.
"Switching to a three-man defence created confusion and erased the last few years of work. Furthermore, any idea of the game was cancelled.
"How many shots on goal did Milan make in the first half? Zero. It was a monologue from Inter who didn't struggle too much and ended up dominating.
"Simone Inzaghi's players are almost all of a high level and all have great experience. You can only win against Inter if you play as a team, something that Milan did not do."
Milan required 58 minutes to attempt a shot in Sunday's game, the latest point at which they have managed their first effort of a Serie A fixture on record (since the 2004-05 season), and mustered just four efforts, with none on target, for an accumulative expected goals (xG) of 0.3.
They face Torino in their next league fixture on Friday, before hosting Tottenham in the first leg of their Champions League last-16 tie four days later.
Predicting Europe's big five leagues: what Stats Perform's supercomputer says
With the last international window of the season over, domestic club campaigns now enter the final straight.
Everything is still to be decided – technically speaking. Title races, European qualification, relegation – all will come to a head over the next two months.
Of course, there are a few outcomes that already look like foregone conclusions, but there's still much to play for in each of the top five leagues.
With club football returning over the next few days, Stats Perform's Artificial Intelligence team have crunched the numbers using their supercomputer to predict the outcome of each league.
How's the outlook for your team?
Premier League
England is the scene of potentially most compelling title race among the top five leagues this season.
Arsenal may have an eight-point lead at the summit, but Manchester City still have a game in hand. As such, the Gunners' chances of winning a first league title since 2004 are 56.2 per cent, perhaps smaller than many might have expected.
That comes down in part to the statistical value attached to City's historic results, particularly over the past few years during their Premier League domination, whereas Arsenal haven't come close to that level of success over the same period.
Therefore, the title race still looks tight.
A little further back, Manchester United (74.5 per cent) are near-certainties to finish third, while the race for fourth promises to be engrossing – Tottenham (19.3 per cent), Newcastle United (29.1 per cent) and Liverpool (24.5 per cent) look set to tussle it out, with Brighton and Hove Albion (10.7 per cent) considered rank outsiders.
At the bottom, Southampton's 41.6 per cent likelihood of finishing 20th suggests they've a huge battle on their hands, but the supercomputer reckons West Ham and Leicester City have enough to pull themselves clear of the drop zone.
The signs are that two of Bournemouth, Everton and Nottingham Forest will join Saints in the Championship.
Bundesliga
Germany's top flight may come to rival the Premier League's title race. Ahead of the weekend's Klassiker between Borussia Dortmund and Bayern Munich, BVB are a point clear.
Yet, Dortmund's probability of finishing top is just 22.4 per cent compared to Bayern's 76.4. Again, it largely comes down to their historic results and Die Roten's dominance suggesting they'll eventually get the job done.
But it's fair to say Bayern's decision makers aren't so confident given their brutal choice to sack Julian Nagelsmann on Friday, replacing him with former Dortmund coach Thomas Tuchel.
Union Berlin aren't out of it given they are only five points behind Dortmund, though this is obviously uncharted territory for them, hence the 0.9 per cent chance of winning their first top-flight title since 1923.
Third looks the best bet for them (40.3 per cent), while RB Leipzig are the most likely to fill out the top four (37.2 per cent).
It's even tighter in the relegation scrap. Only seven points separate 18th from 13th, so even rock-bottom Stuttgart are given a reasonable chance of finishing 14th (10.6 per cent) or 15th (15.2 per cent).
LaLiga
Following Barcelona's dramatic 2-1 win in El Clasico before the international break, LaLiga looks done and dusted at the top with the Blaugrana 12 points clear.
The supercomputer also reckons Atletico Madrid are nearly guaranteed third (80.3 per cent), leaving what is effectively a two-horse race for fourth.
Real Sociedad have fourth at the moment and are 43.7 per cent likely to finish there, though Real Betis (36.7 per cent) aim to push them all the way.
At the other end, Elche are given no more than a 0.1 per cent chance of getting out of the bottom three after taking just 13 points from 26 games.
Otherwise, relegation is difficult to call. Almeria in 19th are only six points behind Real Mallorca in 11th, meaning there are a host of clubs who could yet get dragged into a fight for their lives.
There are two particularly big names among those potentially in trouble. Valencia are in the bottom three and have a 21.9 per cent chance of being relegated, while Sevilla – who are on their third coach of the season after sacking Jorge Sampaoli – are only two points clear of safety.
The computer says Man Utd's next Europa League opponents only have a 5.8 per cent probability of going down, however.
Ligue 1
Paris Saint-Germain seemingly have little to worry about in Ligue 1, with the supercomputer calculating their title chances at 98 per cent.
The tiny hint of doubt gives Marseille (1.8 per cent) and Lens (0.2 per cent) a bit of hope – but even then, it's presumably nothing more than a pipe dream.
There is a similar degree of certainty at the bottom, where four teams will be relegated ahead of the league's size being reduced to 18 clubs next term.
Angers, with 10 points from 28 games, cannot get out of the bottom four according to the calculations, and the other three positions are currently taken up by Ajaccio, Troyes and Auxerre.
Brest and Strasbourg aren't out of the woods yet either, though the supercomputer believes those in the relegation zone are the ones most likely to drop into Ligue 2.
Serie A
If there's one league in Europe that's got a foregone conclusion at the top, it's Serie A.
Napoli have more than a 99.9 per cent chance of winning a first Scudetto since 1990, with the unrelenting Partenopei a whopping 19 points clear of second already.
The race for Champions League qualification promises to be a little more tense.
Eleven points is the gap between Lazio in second and Juventus in seventh. While the Bianconeri are very much outsiders, the other five teams have at least a 15 per cent chance of finishing in the top four.
Lazio, Inter and Milan appear to be the most likely to take those spots, though Roma and Atalanta will fancy their chances of putting a cat among the pigeons.
In the relegation fight, there's a rather clearer picture.
Cremonese and Sampdoria look doomed, while Hellas Verona in 18th are five points adrift of safety, giving them just an 18.8 per cent probability of avoiding relegation.
Maanum stunner inspires Arsenal turnaround against Bayern, Barca ease past Roma into semi-finals
Arsenal defeated Bayern Munich 2-0 at Emirates Stadium to complete a 2-1 turnaround on aggregate and reach the semi-finals of the Women's Champions League.
Trailing to a Lea Schuller header from last week's first leg, Frida Maanum fired in a sensational 20-yard effort to level up the tie within 20 minutes of Wednesday's return game.
Stina Blackstenius powered in a header six minutes later to give Arsenal the lead in the tie for the first time in front of the 21,307 watching spectators in north London.
Jonas Eidevall's side missed chances to kill off the tie, but they saw out the victory to set up a meeting with the winners of Thursday's tie between Paris Saint-Germain and Wolfsburg.
Barcelona earlier booked their spot in the semi-finals, where either Chelsea or Lyon await, with a commanding 5-1 win over Roma at Camp Nou sealing a 6-1 aggregate victory.
Two-goal Fridolina Rolfo scored either side of Maria Leon's curler to put Barca, who finished runners-up to Lyon last season, out of sight before half-time.
Asisat Oshoala tapped in a fourth a minute after the restart and Patricia Guijarro headed in from a corner to complete the rout.
Competition debutants Roma registered a couple of attempts on target in the remaining 40 minutes, but it was plain sailing for Barca in their quest for a second European crown.
'Nobody is perfect' – Pioli insists Napoli not 'unbeatable' ahead of Champions League showdown
Stefano Pioli insisted "nobody is perfect or unbeatable" as Milan prepare to overthrow Napoli in the all-Italian Champions League quarter-final clash.
Milan and Napoli will meet for the first time in European competition on April 12 in the first leg at San Siro, with Luciano Spalletti's side flying high in Serie A and UEFA's top club competition.
The Partenopei are 19 points clear at the Italian top-flight summit and suggested by many as a potential challenger for the European crown.
But Milan have only lost one of their nine all-Italian showdowns in Europe (W4 D4) and Pioli sees no reason why the Rossoneri cannot dream of progressing past Spalletti's in-form side.
The Milan coach said: "Honestly, I'd rather not meet an Italian side. In the Champions League it's better to face a foreign club. Napoli are very strong but we want to play for it.
"They have shown great consistency, strength and quality, they have all the characteristics of a great team, but nobody is perfect or unbeatable."
Pioli's side have not reached the last eight in the Champions League since the 2011-12 term when they were eliminated by Pep Guardiola's Barcelona.
Milan last went beyond that stage in the 2006-07 season en route to lifting the trophy but overcoming Napoli will prove an incredibly difficult challenge.
Napoli have won each of their past three away matches against the Rossoneri, their best such run against them, although they have not triumphed in any of their past five trips to Milan in cup competitions.
Pioli wants to build on Milan's Champions League history but says the Rossoneri cannot take their eyes off the Serie A top-four battle, leading fifth-placed Roma by just a point.
"It's part of the history of this club and the path it has always followed," he added. "We are beginning to write our history, that of Milan in the Champions League is a different path from ours.
"When you go to San Siro to play the Champions League it is something exciting and spectacular that involves everyone.
"We are very busy but we are also focusing on the league. To make this season a positive one, we have to play in the Champions League next year. We have to be careful."
Before the mouthwatering European meeting, Milan visit Napoli in Serie A on Sunday with the Rossoneri's Scudetto soon seemingly heading for Naples.
Pioli's side have been unable to replicate their exploits from last season's title-winning campaign, though the Italian suggested Milan's young side would always struggle to defend their title.
"I don't think there are many teams in Europe that immediately win the second league," he continued. "We won with a very young team, thanks to a project and a club path we are proud of.
"We are one of the few clubs with a sustainable project; only a few teams manage to win and be competitive in Europe.
"That is a leap that we have not yet been able to make but this year too gives us the opportunity to understand great things, to improve and be the strongest club."
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