Costinha has played in the Champions League and Europa League for Olympiacos [Getty Images]Brighton have signed Portuguese defender Costinha on a five-year contract from Olympiacos.The Seagulls are understood to have paid about £11m for the 26-year-old right-back.He spent the past two seasons in Greece and previously played for Portuguese club Rio Ave."Costinha is a player we have followed closely for some time," said Brighton head coach Fabian Hurzeler."He has the defensive capabilities,