AC Milan lost last month's derby against bitter city rival Inter Milan because Ronaldinho went on a three-day booze-filled party, according to Il Corriere Della Sera.
Rumors in Milan claim the Brazilian celebrated for almost a week following his good form in the buildup to the derby.
Ronaldinho spent three days in a luxury hotel in Milan as part of his alleged party, and he booked suites for himself and friends costing $1,400 per night. He spent a total of $105,000 before he checked out to join the team at Milanello on the Saturday -- a day before the derby.
The outcome was that he trained badly in preparation for the match, leading to a poor performance, and Milan's defeat. He missed a penalty, too, fuelling rumors he was not fully prepared.
As things stand, neither Ronaldinho, Leonardo nor Milan have made any comment on the press allegations. The report remains unconfirmed.