Played for both clubs: The seven best Premier League stars to turn out for Arsenal and Chelsea, including supposed traitor Cesc Fabregas

Lassana Diarra

He has now gone off the map almost entirely, but midfielder Lassana Diarra was once one of the Premier League’s top prospects. He failed to make it at either Chelsea or Arsenal, however, before joining Harry Redknapp at Portsmouth and making real waves on the South Coast.