It's worth waiting to see what price Chelsea will set to sell their most expensive player in next summer, because I think if Chelsea don't set a low selling price then no club might want to buy him.
There will be alot of clubs that will be lining up for him out of the EPL. He is young and decent player, probably not good enough for EPL standard but obviously cut above the rest on most league. Something around $25-40mil will probably be settled in for him, I dont see any reason some club would bids him higher than this number. Anyway, Chelsea is in a deep shit performance right now so expecting him to carry the burden of the whole team is a joke
I personally think he is decent enough though but Chelsea definitely made a huge mistake by paying that high to sign him a year ago