The ex-Milan midfielder has recently posted a video on his Instagram stories where he was seen diving from the roof of a yacht.
Il Corriere dello Sport reports that club directors didn’t like his behaviour which could have led to injuries, so they will strictly monitor him until the beginning of the pre-season.
Inter will begin training on July 6, but International players such as Calhanoglu will return to Appiano Gentile next week.
The Turkey international got in trouble last month due to an interview with Tivibu Spor where he appeared to criticise his coach Simone Inzaghi.
Calhanoglu had informed Inter about the interview but had to clarify his claims after it was released, saying that he never criticised the coach.
The Serie A giants could have fined the 28-year-old but never confirmed that they had taken action against their star.