Boss Massimiliano Allegri and forward Robinho clashed in Milan training on Wednesday, reports the Gazzetta dello Sport.
It is being claimed that the two exchanged words at Milanello earlier today in front of about 100 guests who were watching the session.
Allegri is understood to have pulled the Brazilian up in training and the striker didn’t take well to the criticism.
Allegri asked the South American to then finish the session early and the former Manchester City man subsequently headed into the changing rooms.
Milan are preparing for their crucial last day of the season game at Siena where they need a win to qualify for next season’s Champions League.
The futures of both Allegri and Robinho with the Diavolo are in doubt.
The player was close to moving back to Brazil in January, while owner Silvio Berlusconi is said to be thinking of a coaching change despite Allegri’s contract running up to 2014.