Mario Balotelli says he is "sorry" and "has to learn" following his dismissal in Italy's World Cup qualifier against Czech Republic.
Balotelli, 22, received two bookings in four minutes from referee Svein Oddvar Moen as a needless challenge on Michal Kadlec was followed by an arm allegedly striking Theodor Gebre Selassie in the face.
The AC Milan striker reacted angrily to the sending off, punching and kicking the walls of the tunnel before heading into the dressing room.
After the game the forward tweeted: "Write whatever you want, but in the Confederations Cup cheer for another nation. I tell you that from my HEART. (And watch the game again. ALL OF IT.)"
However, the attacker apologised on Saturday.
"... Good morning ... Yesterday my reaction wasn't right, I apologise ... SORRY ... To my team ... I have to learn ... Still ... ," he tweeted.
Czech Republic were unable to make their numerical advantage count and the match finished all square, leaving Italy at the top of Group B, four points ahead of second-placed Bulgaria.