Italy fans threw fake dollar bills at goalkeeper Gianluigi Donnarumma during Sunday's Under-21 European Championship game against Denmark.
The 18-year-old last week revealed his intention to leave AC Milan, a decision that prompted anger amongst fans of the club.
In a play on his name, some of the travelling supporters also shouted "Dollarumma" at the youngster.
Assistants were required to come onto the pitch to clear away the fake money, and the game was paused.
Italy went on to win their first group game 2-0 with goals from Lorenzo Pellegrini and Andrea Petagna.
Large sections of the Milan support feel betrayed by Donnarumma's decision to exit, particularly at a time when the club are showing ambition in the transfer market.
The highly rated 18-year-old had previously expressed his desire to stay at Milan amid constant speculation.
Agent Mino Raiola has received much of the criticism, accused of turning Donnarumma's head away from Milan for his own financial gain, but he was typically unapologetic following his announcement that the player would be leaving.
"We were taken by surprise, as we had hoped Donnarumma would be the goalkeeper taking Milan into the future," he said - via BBC Sport. "Naturally, the decision leaves a bitter taste in the mouth, but now we have to go forward."