Stefano Pioli said he was unhappy with his attempts to prepare Milan for Thursday's Coppa Italia clash with Genoa.
The Rossoneri were taken to extra time at San Siro before they eventually progressed to the quarter-finals with a 3-1 victory.
Genoa, with just one Serie A win all season and no Coppa victories over Milan since 1936-37, enjoyed an encouraging first half and took the lead through Leo Ostigard's header 17 minutes in.
It looked as though coach Andriy Shevchenko would pull off a shock against his old side until Olivier Giroud headed in an equaliser with 16 minutes of normal time left.
Milan had by this point taken charge of the contest and deservedly went ahead through Rafael Leao, whose cross looped in off the far post, before Alexis Saelemaekers added a fine third.
While Pioli was pleased with his players' response to falling behind, the Milan coach blamed their ineffective first-half display on his own attempted preparation.
"I'm not satisfied with my work," he told Sky Sport Italia.
"If the whole team doesn't get the approach to the match right, it means the coach was not good at stimulating them from a mental point of view.
"In the first half, we struggled and we played without rhythm. We deserved to go behind. Then, it's true that we reacted well; it's the sign of important growth in terms of character and the mental side of this team.
"I'm disappointed because I thought I prepared the team well. I didn't succeed there."
Milan's poor first half was compounded when defender Fikayo Tomori limped off, and Pioli will now anxiously await further medical checks.
"He felt something strange in his knee," he said. "We're waiting a few days for some more diagnoses, but we hope to have all those on Monday. We have quite a limited group in terms of numbers."
Leao, who has been directly involved in four goals in his first three games of 2021, was delighted to inspire another turnaround – even if his goal was unintentional.
The Portugal international admitted: "I wanted to cross because we have someone so good at heading [Giroud] with Ibra [Zlatan Ibrahimovic], and when I can't shoot, I try to cross.
"I try to give my best; today, I did so. We won and I scored."
Hurtig the hero after late goal sends Arsenal into Champions League quarters
Lina Hurtig's 89th minute winner ensured Arsenal progressed to the quarter-finals of the Women's Champions League after edging Juventus 1-0 on Thursday.
After being frustrated for large parts of the encounter, Hurtig bundled home from close range after Martina Lenzini's poor clearance to book the Gunners' place in the last eight.
Despite Arsenal dominating the early exchanges, it was Juventus who had the first sight of goal, though Eva Schatzer's effort was easy for Daphne van Domselaar to gather.
In a first half that saw just two shots on target, both coming from the visitors, Renee Slegers' substitutes proved to be the difference for Arsenal.
Slegers introduced Beth Mead, Stina Blackstenius and Hurtig late on, with the latter somehow putting Kim Little's cross over the bar from five yards out.
However, the Swede would atone for her earlier error, combining with fellow substitute Blackstenius to net against her former club and send them out of the competition with two group games remaining.
Meanwhile, in Group D, Barcelona edged closer to the quarter-finals of the competition with a convincing 4-1 victory over St. Polten at the Generali Arena.
The reigning champions are still three points behind Manchester City following their 2-1 win over Hammarby, and know a win against the Swedes next month will see them progress.
Kika Nazareth opened the scoring in the 20th minute after capitalising on a mistake by Kamila Dubcova, notching her second nine minutes later from close range.
Barca found themselves three goals up at the break when Vicky Lopez netted her first goal in the competition to put the result beyond doubt.
There was also a landmark moment for Alexia Putellas, who netted her 200th goal for the club with a well-taken effort into the far corner.
Valentina Madl took some of the shine off an otherwise impressive display from the visitors, who have now taken their tally to 20 goals from their four matches in the competition.
Guardiola agrees two-year contract extension with Man City
Pep Guardiola will be Manchester City manager for at least two more seasons after 2024-25, after he signed a two-year contract extension on Thursday.
The 53-year-old was coming to the end of his City deal, which was due to expire at the end of the current campaign, but he has opted to remain at the Etihad Stadium.
The deal itself will take Guardiola's tenure at the club to over a decade, making him City's longest-serving manager since Les McDowall in 1963.
There had been suggestions that he may leave at the end of the season following the announcement that director of football Txiki Begiristain was on his way out.
Guardiola was strongly linked with the England job after Gareth Southgate resigned in the wake of their Euro 2024 final defeat, but the Football Association appointed Thomas Tuchel last month.
“Manchester City means so much to me," Guardiola said. “This is my ninth season here; we have experienced so many amazing times together. I have a really special feeling for this football club.
“That is why I am so happy to be staying for another two more seasons.
“Thank you to everyone for continuing to trust and support me – The Owner, The Chairman Khaldoon, Ferran, Txiki, the players and, of course, the fans… everyone connected to Manchester City. It has always been an honour, a pleasure and a privilege to be here.
“I have said this many times before, but I have everything a manager could ever wish for, and I appreciate that so much.
“Hopefully, now we can add more trophies to the ones we have already won. That will be my focus.”
Having been appointed in 2016, Guardiola is by some distance Manchester City's most successful manager of all time, having won 18 major trophies during his time at the club.
That list includes their first-ever Champions League triumph in 2023 and six Premier League titles, including an unprecedented four on the spin.
He also boasts a 72.04% win percentage across all competitions, which is unsurprisingly the highest of any full-time City manager in history.
Shaw at the double as Man City progress in Champions League
Khadija Shaw scored twice as Manchester City beat Hammarby 2-1 to seal their place in the Women's Champions League quarter-finals.
Gareth Taylor's team entered Thursday's game with a perfect record in Group D, and their fourth win in as many European matches ensured they finished in the top two.
Shaw—the leading scorer in the Women's Super League this season with eight goals—put them ahead in the 31st minute, driving into the area after taking in Yui Hasegawa's pass before seeing her shot deflect into the top corner.
Shaw was booked for celebrating in front of the home fans despite appearing to have objects thrown at her from the stands, and Hammarby should have levelled when Julia Blakstad fired wide 10 minutes later.
The hosts did draw level three minutes into the second half as Ellen Wangerheim tapped home while City's Laura Blindkilde Brown was down appealing for a free-kick.
That parity was short-lived, though, as Shaw blasted into the top corner from 25 yards out, taking her overall tally for this season to 12 goals in all competitions.
In Group C, meanwhile, Bayern Munich lost their perfect record as they played out a 1-1 draw with Valerenga, boosting Arsenal's hopes of topping the pile.
Jovana Damnjanovic came off the bench to put Bayern ahead 15 minutes from time in Norway, but Elise Thorsnes headed home following an 88th-minute corner to snatch a point for the hosts.
Arsenal could now move within a point of Bayern when they face Juventus in Group C's other match later on Thursday.
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