The Italy midfielder clashed with Inter coach Simone Inzaghi after their Champions League final thrashing by PSG.
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Frattesi was left on the bench as Inter collapsed 5-0 in Munich and he confronted Inzaghi after the final whistle, says La Gazzetta dello Sport.
If Inzaghi is confirmed for next season, Frattesi will seek a move away.
The 25-year-old sits on a contract with Inter that extends through the summer of 2028.
The midfielder has been linked with Napoli and former club Roma this season.