Balotelli angered Inter teammates over his red card in the 1-1 draw against Rubin Kazan, with Dejan Stankovic snapping: "It's hard to play with ten men."
"The dismissal was right, the player was wrong," said Mourinho.
"I won't be talking about Balotelli. I've spoken to him directly in the locker room and will do so again. The sending off was correct.
"I'll be curious to see what people write about this tomorrow."