If we insist on this system and intend to be super duper pressy then we might as well just sell him
Playing the role he currently is gives him no chance
Sellés needs to adapt to the squad he's got. And Hamer is the best player in the squad
He needs to be able to focus on attacking. Not covering ground, balancing defending and attacking, when he already has enough trouble getting cards and getting tired
He needs to play as a 10 without defensive responsibility and without requirements to press too much. Let him use his energy to do positive things with the ball