West Ham United head coach Julen Lopetegui has a chance to sign Mario Hermoso on a free transfer this summer. The Hammers have already been linked with a move to sign the 29-year-old centre-back this summer, but Aston Villa allegedly want to sign him as well. Julen Lopetegui has already bolstered his central defensive ranks at West Ham with the signing of Max Kilman, and it seems as though he’s closing in on a deal for Jean-Clair Todibo as well. Addressing the centre-back department would have been the main priority for Lopetegui this summer. The Hammers shipped an embarrassing 74 Premier Leag…