Aston Villa have now made an enquiry about signing a Chelsea defender during this summer transfer window. Blues fans will be eager to see how the defence shapes up next season under new head coach Enzo Maresca, who’s preferred a back four system during his brief managerial career so far. Now that Thiago Silva has left, there’s got to be serious question marks about the experience and quality of the backline at Stamford Bridge. READ MORE: What Chelsea have already recognised about signing Tosin Adarabioyo to replace Thiago SilvaIt’s now been claimed that Premier League rivals Aston Villa would …