Jamal Musiala contract still has 2 years left at Bayern Munich. Even Musiala is currently Kompany's first choice player even though he is only 21 years old. He became the main midfielder in both Germany and Munich. Munich tried to keep him. But there are rumors that Man City and Man United are trying to buy him. Man United's success in bringing De Ligt and Zirkzee is also Man United's capital to continue to approach Musiala. But the Munich president is still very confident Musiala will stay in Munich.
Source:
https://www.mirror.co.uk/sport/football/transfer-news/bayern-musiala-future-manutd-mancity-33642659Jamal Musiala will be a target in the winter or summer transfer, but several clubs such as Barcelona and Arsenal are also chasing to bring Jamal Musiala from Bayern Munich but firmly that Bayern will not sell him they will extend the contract with Jamal Musiala.
Unless the four clubs offer a fantastic price, maybe Jamal will change his mind of course Bayern Munich will get a lot, I don't know if there is a clause for Jamal Musiala? Usually this is what makes it difficult for clubs to buy players, like Osimhen who is blocked by a clause so that other clubs dare not redeem him.
There is no chance that he would be leaving Bayern in the winter transfer window. Bayern has never sold an important player during that time ever. But in summer it will become very interesting and lots of clubs will probably try to convince Musiala to leave Bayern. But what is the chance for other clubs to buy him? Bayern isn't poor and they don't need the money, which means they are not like Dortmund who would sell for 120 million. If any club wants Musiala next summer, I think they would have to pay around 160 million and more in order to have a little chance to get Bayern Munich to think about it. Musiala is 21 years old and Bayern knows that the chance to find another talent with that quality and that age is close to zero. I don't see how they would let him go next summer.