With Masche out injured and Pique-Umtiti being one yellow card away from suspension I think there's a good chance we might see him play as a CB at least for Leganes.
He has decent height 5'10 and the few times he played there he was good at bringing the ball out from the back and solid positionally wise. Maybe there's a chance he could make the transition like Mascherano has. I mean not as a full time CB but stepping in every now and then.