Stefano Pioli denied his substitutions were to blame but acknowledged Milan had "messed up" after Roma snatched a 2-2 draw in a dramatic finish to their Serie A clash at San Siro.
Having watched Napoli go eight points clear at the summit by beating Sampdoria earlier on Sunday, Milan looked set to cut the gap once again as goals from Pierre Kalulu and Tommaso Pobega put them in command.
However, Roger Ibanez halved the deficit with Roma's first shot on target in the 87th minute, before Tammy Abraham pounced on a rebound from a stoppage-time free-kick to rescue a point.
The remarkable finale saw Milan fail to win a Serie A match when 2-0 up after 85 minutes for the first time since 2009, leaving Pioli stunned after the Rossoneri dominated the contest.
"We must continue to play like this but remember that matches finish in the 95th minute and that more attention is needed," he told DAZN.
"We conceded two goals from set-pieces which we can't concede. We are disappointed, we played well and we deserved to win. Unfortunately, we messed up our own lives."
In his post-match press conference, Pioli was asked whether his decision to introduce a third central defender in Matteo Gabbia invited a late spell of Roma pressure, but he does not believe the change – or a lack of application from his players – was to blame.
"Oddly enough we conceded two goals from set-pieces when we had more central defenders on the pitch. I reviewed the goal and there were some errors in marking," he said.
"When I make substitutions, I always think they are the best things for the team. We gave away a corner and made mistakes on set-pieces.
"I don't think the tactical aspect has anything to do with it. I don't think we lost points for the three-man defence. Maybe I'll bring it in again.
"It will teach us to stay more focused in the next matches. It wasn't a problem of attitude. If we talk about willpower and spirit, we are second to none."
Roma failed to have a shot on target in the first half of a Serie A game for the third time this season on Sunday, while 48 per cent of their league goals this term have now come from set-pieces (10/21).
Despite the Giallorossi's lack of creativity, Abraham was always confident he would get a chance, telling DAZN: "We had to be patient, this is a difficult stadium.
"We knew that an opportunity could come, I felt it in the finale and I was good. Before the [World Cup] break, I said we would be back in shape, now let's continue like this."
Coventry City 2-3 Hull City: Tigers win five-goal thriller to keep play-off hopes alive
Hull City kept their hopes of gatecrashing the Championship play-offs alive with a thrilling 3-2 win over beaten FA Cup semi-finalists Coventry City on Wednesday.
Noah Ohio scored the winner with his first touch after coming on as a second-half substitute as Hull moved within three points of sixth-placed Norwich City with two games to play.
Coventry, meanwhile, saw their own hopes of returning to Wembley Stadium for a second successive play-off final all but ended, as they sit six points further back with three matches remaining.
Three days on from their remarkable comeback against Manchester United, the Sky Blues twice fought back to level things at Coventry Building Society Arena. Jaden Philogene's shot squirmed under goalkeeper Bradley Collins to put Hull ahead 31 minutes in, but Kasey Palmer levelled within five minutes with a stunning free-kick.
Hull went back ahead in controversial circumstances on the stroke of half-time, Liverpool loanee Fabio Carvalho converting from the penalty spot despite replays showing Joel Latibeaudiere's foul on Liam Delap took place outside the area.
Mark Robins' men again dragged themselves back into the game as Bobby Thomas headed Jay Dasilva's cross in just before the hour mark, but it was Liam Rosenior's visitors who found a winner.
Thomas went from hero to villain as his poor back pass sold Collins short, and Ohio got a toe to the ball to score the winner, keeping Hull's hopes of Premier League football intact.
Van Dijk: Liverpool have 'no chance' in title race after derby defeat
Virgil van Dijk conceded Liverpool might be out of the Premier League title race after they suffered a surprise 2-0 defeat to Everton in Wednesday's Merseyside derby.
Jarrad Branthwaite and Dominic Calvert-Lewin scored in either half to give the Toffees their first win over Liverpool at Goodison Park since 2010.
Liverpool struggled to find a way through the Toffees' defence despite dominating for long periods, and the Reds' captain says they will not outlast Arsenal and Manchester City without major improvements.
Speaking to Sky Sports, Van Dijk said: "If we play like today, then we have no chance to consider ourselves in the title race.
"We have to just focus on the next game and that will be a tough one anyway, so we will see.
"We're very disappointed, in so many ways. I think everyone has to look at their own performances. Did they really give everything, and do they really want to win the league?
"We're still fighting and there are still games after tonight, but if we play like we did overall in the game today – not winning challenges and giving the referee a chance to give free-kicks like he did many times, then you have no chance to win the title."
Howe: Newcastle performance in Palace defeat 'way off' Spurs win
Eddie Howe admitted Newcastle United's performance in the 2-0 loss at Crystal Palace on Wednesday was "way off" the one that saw them thump Tottenham in their previous game.
Howe's men hammered Spurs 4-0 in their last match, but they never got close to matching the attacking verve from that outing and a Jean-Philippe Mateta double condemned the Magpies to defeat at Selhurst Park.
Newcastle didn't even manage a shot on target until the 87th minute, accumulating just 0.42 xG (expected goals) as the likes of Alexander Isak and Anthony Gordon struggled to make an impact.
Only against Manchester City in August (one) have Newcastle recorded fewer shots on target in a Premier League game this season than their two against Palace, and Howe was critical of his team's display in the loss, one that all but ends their hopes of finishing in the top four.
"[It is a] bad day for us," Howe told Newcastle's club media.
"I thought we were disappointing today, especially in the first 60 minutes. We were way off our levels against Tottenham and our best levels.
"I thought technically we didn't deliver a good performance, and out of possession I don't think it was a particularly good performance either."
Newcastle were unlocked twice for Mateta to score by a Palace side who themselves only generated 0.88 xG.
Howe was left frustrated by the manner in which his side conceded, adding: "I think we'll be disappointed with our performance technically today, and that's probably epitomised by the two goals where we're disappointed with how we've given them the ball in those situations and then how we defended.
"I think the goals sum up aspects of our performance where there was some good, lots of moments that could have led to opportunities, but we were slow to shoot around the box," he said.
The defeat, combined with Manchester United's 4-2 win over Sheffield United, means Newcastle drop to seventh, while eighth-placed West Ham are two points behind with a game in hand.
Newcastle have now lost eight of their last 11 Premier League away games, while they have lost on four occasions in London in the league this term, only doing so more times in a Premier League season in 2000-01 and 2005-06 (both five).
It's been a disappointing season for Howe and his side, especially compared to the heroics of last term when Newcastle finished in the top four, and the Magpies boss knows there's work to be done to get back to those levels.
"It's a day that we have to take our punishment, deal with it, and then try and improve," Howe continued. "It's frustrating because we know we're capable of much better."
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