It was reported that he did the same training as slow ass players like Rakitic when Setien became coach. At Dortmund sprinting was a much bigger part in his training since this is what he does 80% of the game. No wonder he got injured in games all the time. Maybe they can fix the mistakes Valverde's coaching staff did when it comes to Dembouz's game preparation.
I got too often disappointed by him to be optimistic, but I gotta say that there was a period of time when he literally was unplayable for opposition. I just hope he can stay fit for a longer period of time so that he can work on his shortcomings like sloppy passing, first touch and overhasty finishes.