Not sure they would take Mbacke after they've already signed Kambwala. Probably looking for someone bit more experienced. Mandi is leaving too so they only have unproven United kid, injury prone Bailly and 38 yo Albiol. But their defense was bad last season so makes sense to make changes there. Sergi Cardona on a free is a good signing as a backup LB.
Also, they're reportedly trying to get Nico Jackson back from Chelsea. And also Robert Sanchez.