The addition of a new centre-back is vital for Aston Villa before the start of the new Premier League season. As it stands, Unai Emery only has three fit players in this position as Tyrone Mings continues to sit out on the sidelines. On top of this, it appears that Diego Carlos is edging closer to a Villa Park exit. Fulham are believed to be keen on the defender with Villa open to offers. If the centre-back does depart, it would leave the club with a host of problems if a replacement is not found. It is believed that Villa are looking to sign Trevoh Chalobah from Chelsea, with the Birmingham o…