Sorry to say but this "poco poco" return of Dembele is just crazy.
I respect Valverde, he does good things - and also not so good things - but as a matter of fact the "slowly slowly" thing is bad for the player, it's bad for those who might not play that often due to his return and hence bad for the entire team.
He is a sort of star, or at least a potential one, so when he is fit - he should play.
If he is not fit, then he shouldn't play.
When Messi was out for little more than two months, there was no "poco poco" return, and I can go on with other examples... When Umtiti is back, again a "poco poco" return will happen?