Former Aston Villa midfielder Nigel Reo-Coker has fired a clear warning to Unai Emery ahead of the transfer window slamming shut. Aston Villa travel to West Ham this evening for their Premier League opener but in the background, Unai Emery has some creases to iron out in his squad. Emery confirmed that Villa were trying to add more players to their squad and that need has become more prevalent following Cameron Archer’s departure to Southampton. The Spaniard has also revealed that defender Diego Carlos will remain at the club, despite Fabrizio Romano previously claiming that Fulham were in ‘ad…