So it seems like German free agent Mats Hummels definitely could join West Ham United on a free transfer. Mats Hummels was strongly linked with a move to join West Ham throughout the month of August, after he was released by Borussia Dortmund. West Ham didn’t sign him in the end, but Julen Lopetegui has now left himself very short in the centre-back department, after Kurt Zouma and Nayef Aguerd both left the London Stadium. Taking that into account, Hummels would be the perfect option for the Hammers head coach. With that in mind, it was frustrating when it emerged that Roma were all set to si…