Brazil defender Alex has left PSV Eindhoven for Chelsea after he signed a three-contract at Stamford Bridge on Friday, the London club announced. "Alex Rodrigo Dias da Costa today passed a medical and signed a three-year contract with Chelsea," a statement on the Chelsea's Web site read. The 25-year old center-half was on standby to join the Blues as he has been waiting to be granted a UK work permit. Alex was a member of the Selecao team that clinched the Copa America title in Venezuela this summer.