Balotelli left Manchester City to return to Italy in January, and Tevez recently followed him out of the Etihad Stadium exit door.
He has linked up with Juve on a three-year deal after rejecting interest from Milan and other clubs, but Balotelli is still confident of claiming Serie A glory.
"I don't fear Juve, I fear nobody," he said. "Tevez? He's a friend and I told him to come to Milan, but he didn't listen me and he went to Juve.
"If it happens, when we meet on the pitch, I'll make fun of him."
Balotelli's own future had been the subject of speculation earlier in the summer despite the fact that he only moved in January, but Milan recently made it clear that he would not be sold.
"It has been good to hear this," said the striker. "In football you never know, but Milan is the club I have in my heart, they are a good club with really good supporters.
"Now I feel good here and I'll stay here, then, one day, we will see."
Balotelli believes Milan need to bolster their squad to kick on from last season and has suggested that the club make a move for Paris St Germain's Zlatan Ibrahimovic.
"I'd like to play with him," said Balotelli. "Maybe if I say it, they will buy him.
"I hope Milan can strengthen because we are strong, but to be able to compete with the other clubs on a European level we need to strengthen."