I'd sell him if Im in charge of the transfer. Losing him is not a bad thing at all. In fact in can have many knocks on effect. We can play 2 in the midfield and not worrying that he wont track back or get exposed, we dont have to play 433 to accommodate him and requires 2 engine just to get the best out of him, we also can play with a true no 10 (bruno) that can actually create and score. This will certainly unlock most opportunities even after losing a world class talent like him.
At his best, he is just a luxury player. He cant and wont change the game out of nowhere ala Hazard, Messi, Ronaldo, Salah etc. He IMHO is a gold plated engine where we dont even have all the components of a working cars. Plus he isn't worth the hassle.
I hope the board will sell him. We can get players like the betis midfielder Coleso/bruno/Ndidi that actually work twice as harder and are as good as him. I really hope we sell him.