Brentford sign £40m defender Diouf from West Ham

El Hadji Malick Diouf joined West Ham last year in a £19m deal and played four matches for Senegal in this summer's World Cup [Getty Images]Brentford have signed West Ham defender El Hadji Malick Diouf in a deal worth up to £40m.The 21-year-old Senegal left-back has joined on a five-year contract, with the club having an option to extend it by a further year.The move sees Brentford paying an initial £35m for the player, with a further £5m in add-ons.Diouf played in West H