Bayern Munich decision not to extend Tolisso contract is the right thing in my opinion, because Tolisso has often been injured so he has not been able to make a big contribution to Bayern Munich, I don't know the reason for OL decision to sign him again, because even though he is still young but his performance so far every season has continued to decline, especially since Corentin Tolisso injury history will be hampered his later performance with OL.
He has never been fully accepted in the team. In 71 games, he scored only 11 goals and make 7 assists for goals. His injuries have made more difficult. 5 years in Germany and now it's back to his old team Olympique Lyon. He is even a national player and was 2018 Worldchampion 5x German Champion and 1x Champions League Winner, so money they will make with him, he is only 27 years young.