West Ham have confirmed the signing of Boavista defender G
The Hammers took to their official website to confirm the deal, with the teenager expressing his delight at moving to England.
"I’m an aggressive player, a little bit different on the pitch than off it. I’m calm, and I like to have the ball and build the game from the back.
“Our scouts in Portugal have watched his development very closely for some time now and we are very happy to have secured his transfer.
“He has made excellent progress at both club and international level, playing for Portugal in the European Under-19 Championship final this summer.
“He is of course a player for the future, with a lot of potential in front of him, but we feel he is ready to be with the first team squad from both a physical and technical point of view.
“He has a very good character and mentality, and speaks good English, which will help him to settle more quickly as a young player arriving in a new country.
“We look forward to seeing Gonçalo continue his development with us and wish him much success in the future at West Ham United.”
Cardoso made 15 appearances for Boavista last season, helping to keep eight clean sheets in the games he played. He is expected to join up with the club's Under-23s for now, though he has been awarded the number 20 shirt already.