Balotelli was stuck in the stands for Inter's 1-0 win over Fiorentina last night.
And La Stampa says Mourinho could continue the punishment for the big Juve game.
It's claimed Balotelli was axed after a heavy night on Thursday. The striker arrived late for training the following morning, which was enough for Mourinho to act.
Today, Balotelli will train with the kids of the Primavera squad and may even turn out for them this weekend rather than be involved in the senior team.