Milan lost their fifth pre-season match in a row and new coach Leonardo has reiterated his call for new signings at the seven-time European champions.
Milan lost on penalties to Boca Juniors following a 1-1 draw in the Audi Cup in Munich on Thursday.
That followed a 4-1 defeat to hosts Bayern Munich the day before and three defeats out of three in the World Football Challenge in the United States against Club America, Chelsea and Inter before that.
Leonardo has once again pleaded with his bosses to bring in new players.
"This squad is not sufficient for all the commitments we have, we need to add a couple of players," he said.
Since the end of last season Milan have sold Kaka to Real Madrid for €67 million, seen Paolo Maldini retire and David Beckham returned to Los Angeles. Coming into the club have been American defender Oguchi Onyewu, Brazilian centre-back Thiago Silva and Massimo Oddo.