Pablo Mari underwent successful back surgery on Friday after Monza's on-loan Arsenal defender survived a stabbing attack near Milan.
The Spanish defender is expected to be out of action for at least two months, Monza said.
One person died in Thursday's attack and a suspect was arrested after being disarmed, with former Napoli footballer Massimo Tarantino named as being among those who stopped the assault.
Monza said in a statement: "The specialists of the general surgery-trauma team of the Niguarda hospital in Milan this morning carried out the surgery to reconstruct the two injured muscles on Pablo Marí's back.
"The surgery went well and a hospital stay of two or three days is expected."
Monza said a rehabilitation stage will begin once Mari is discharged.
"This type of muscle injury usually requires two months of rest before you can resume physical activities," the club statement added.
Italian newspaper Gazzetta dello Sport reported Mari recalling the attack, saying: "I was with the pushchair with my child inside and I felt an excruciating pain in my back. Then that man stabbed another in the throat.
"I was lucky, because I saw a person die in front of me."
A host of well-wishers have sent messages of support to Mari, including several of Monza's rival Serie A clubs.
The man who died in the attack was a shop cashier named as Luis Fernando Ruggieri.
Mari was visited in hospital on Thursday evening by Monza chief executive Adriano Galliani and head coach Raffaele Palladino.
Galliani said: "Pablo is an amazing guy. He had the strength to joke, telling me that he will be on the field on Monday.
"I brought him greetings from president [Silvio] Berlusconi and everyone, his team-mates who would have liked to come here even though, obviously, it was not possible."
Galliani said Mari "was probably saved by his height", as the stab injury missed his vital organs.
The former Milan executive added: "From a psychological point of view it seems to me that there are no problems, even if I am not a doctor."
Rumour Has It: Man Utd sanction £80m move for Kane to get the jump on transfer rivals
Harry Kane's future at Tottenham remains in limbo, given his contract status and the departure of Antonio Conte.
The 29-year-old forward, who recently became Spurs' all-time leading scorer, is out of contract in 2024.
Kane has previously spoken about his desire to contend for silverware and almost joined Manchester City in 2021.
TOP STORY – MAN UTD SANCTION KANE MOVE
The Manchester United bosses have sanctioned a potential £80million deal for Tottenham striker Harry Kane, reports the Daily Star.
United are ready to ramp up their interest in the England captain, who has interest from Bayern Munich, Barcelona and Chelsea.
The report claims United hope to get the jump on their rivals and open up talks soon, with a view to having a deal agreed with Kane within weeks.
ROUND-UP
– The Times reports Bayern Munich want to sign Chelsea midfielder Mason Mount who previously worked with the German champions' new boss Thomas Tuchel.
– Arsenal are circling for Eintracht Frankfurt's Danish midfielder Jesper Lindstrom who may be available for €30m, reports Sport1.
– The Mirror claims Liverpool have joined the battle to sign Evan Ndicka from Eintracht Frankfurt as a free agent in the off-season.
– Barcelona may cash in on Samuel Umtiti's revival on loan at Lecce and look to recoup a transfer fee this off-season according to SPORT.
– Sky Italy claims former Real Madrid boss and France World Cup winner Zinedine Zidane is on Tottenham's shortlist to replace Conte, along with Mauricio Pochettino, Julian Nagelsmann and Luis Enrique.
Messi hopes the 'craziness never ends' after 100th international goal and wild celebrations
Lionel Messi hopes the "craziness never ends" after scoring his 100th goal and ninth hat-trick for his country amid Argentina's homecoming World Cup celebrations on Tuesday.
La Albiceleste routed Curacao 7-0 in Santiago del Estero, with Messi's 20th-minute opener bringing up his 100th international goal, joining only Cristiano Ronaldo (122) and Ali Daei (109) in achieving that feat.
Messi became the first world champion to score 100 international goals, and he showed no signs of stopping there with further first-half strikes for a treble, taking him to 102.
The milestone came as Argentina rounded out their first two games back in their homeland since December's World Cup triumph with wild celebrations, initially in Buenos Aires for Thursday's 2-0 win over Panama.
The players emulated their celebrations from Qatar after the Curacao game, hoisting the World Cup trophy again after it came down from the stadium roof and doing a lap of honour to greet the supporters.
Messi was also presented with a plaque by Argentine Football Association president Claudio Tapia to acknowledge his 100th goal.
"What a nice way to close these dates, impressive today all the people in Santiago del Estero," Messi wrote on Instagram.
"I wish we can continue to share together many moments like these and that this craziness never ends!!!"
Messi's achievement comes after netting 21 goals in his 14 games for Argentina, along with seven assists. That has taken him to 156 goal contributions, which is the most in international football.
Argentina head coach Lionel Scaloni added: "As for Lionel Messi, what I want is for him to be on the pitch and be happy."
He added: "These days were different to the previous friendlies because the players were allowed to be with their people.
"We felt that they had that desire to go out to contact the outside, although that meant that it was difficult to prepare these two games. But in the end we got them through by playing with intensity."
Arteta issues Saka warning - 'He has room for improvement'
Arsenal manager Mikel Arteta has heaped praise on Bukayo Saka for his consistency but claims the youg star still has room for improvement.
Saka has been a key pillar in Arsenal's Premier League success this term, with the side sitting eight points clear of second-placed Manchester City as they chase their first league title since 2003-04.
Only Manchester City's Erling Haaland and Tottenham's Harry Kane have more combined goals and assists in the league this season, with Saka having netted 12 goals with 10 assists. Saka has also started all 28 of Arsenal's league games this campaign.
"First of all, I think you have to recognise what he's been doing," Arteta told Sky Sports about 21-year-old Saka.
"The consistency he's shown at his age and at this level is something rare to see. He's taken it with normality.
"If you ask me if he has room for improvement, I would say: 'Yes - a lot.' He's never satisfied, he always wants more and he can still do a lot of things better and more efficiently, but we are really pleased to have him."
Talks are ongoing between Arsenal and Saka on a new deal, with his current contract due to expire in 2024.
Last week former Arsenal centre-back Kolo Toure urged the club to sign Saka on a 10-year deal to secure his long-term future.
Saka was outstanding for England at last year's World Cup and netted in Sunday's 2-0 win over Ukraine at Wembley.
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