An Italian news website published photos it says were taken at lunchtime on Sunday of Ibrahimovic with friends, all without masks and surrounded by wine glasses, in the restaurant which should have been closed to on-site diners.
Zlatan Ibrahimovic, who turns 40 in October, has been credited with turning Milan into title contenders again since his return to the Serie A club in January last year.
Zlatan Ibrahimovic ends five-year international retirement, to play in World Cup qualifiers for Sweden
AC Milan striker Zlatan Ibrahimovic was included on Tuesday in Sweden’s squad for World Cup qualifiers against Georgia on 25 March and Kosovo three days later, as well as a friendly against Estonia on 31 March.
A tailor-made score has been established to allow the footballer to ensure his commitments with the festival, broadcast live for five nights from Tuesday, 2 March, while playing with the Milan club.
Inter opened up a four-point lead over their second-placed opponents as Antonio Conte's side target a first league title since their unprecedented treble under Jose Mourinho in 2010.
Serie A: Zlatan Ibrahimovic nets 500th club goal to help AC Milan beat Crotone; Lazio win against Cagliari
Ibrahimovic reached the landmark in 825 games, having made his professional debut for Swedish club Malmo in 1999.
Ibrahimovic’s one-match suspension is because of the two yellow cards and his subsequent sending off during Tuesday’s game, while Lukaku’s one-match suspension is for accumulated cards.
AC Milan pulled five points clear of city rivals Inter Milan and Sassuolo, with AS Roma and Juventus six points adrift.
Ibrahimovic, who retired from international football after Euro 2016, has been in superb form since the start of the new Serie A season.
The triumph on Sunday makes Jose Mourinho the first Manchester United manager to win major silverware in his maiden season at Old Trafford.
Jose Mourinho will have to get past former club Chelsea if FA Cup holders Manchester United are to keep their hopes of retaining the trophy alive following the quarter-final draw
La Liga: Antoine Griezmann 'feels great' at Atletico Madrid despite Manchester United showing interest
Antoine Griezmann insists he feels "great" at Atletico Madrid and hailed the impact Diego Simeone has had on his career despite being consistently linked with the Premier League.
Jose Mourinho took a swipe at his old club Chelsea as the Manchester United boss accused the Premier League leaders of lacking style.
Gabriel Jesus and Henrikh Mkhitaryan stole the headlines as Manchester City and Manchester United made up important ground in the race for Champions League qualification with wins
Gabriel Jesus opened his Manchester City account in a 4-0 stroll at West Ham United on Wednesday that sent his side level with fourth-place Liverpool in the Premier League.
Non-League Sutton will face Arsenal in next month's fifth round of the English FA Cup after being given a home draw against the Premier League giants on Monday.
Headers from Marouane Fellaini and Chris Smalling, and second half efforts from Henrikh Mkhitaryan and Bastian Schweinsteiger ensured holders Manchester United enjoyed a comfortable 4-0 fourth round FA Cup victory against Wigan
Anthony Martial can play his way into Manchester United's starting XI with a convincing performance against Wigan Athletic in the FA Cup on Sunday.
Manchester United survived a scare to reach the League Cup final after Oumar Niasse's late goal earned Hull City a 2-1 victory in the semi-final second leg.
Zlatan Ibrahimovic believes his goal-scoring form for Manchester United has forced his critics to eat their words.