"In past tournaments, we've seen players who excelled secure moves to top clubs. That's my goal. I aim to showcase my skills on the European stage and prove my worth," Onana's Quote
Its pretty obvious that he is going to leave the club regardless of how well he plays this summer and I'm sure he has been given our blessing to look for another club.
The fact is he is very eager to to get the best transfer possible should be great news to us (and also Lille who have a decent sell on) and doesn't show a lack of class at all.