The Hammers have announced the arrival of Portuguese centrre-back Goncalo Cardoso on a five-year deal.
The Portuguese joins West Ham from Primera Liga side Boavista in a £2.75million deal. He signed a five-year contract, with an option to extend a further 12 months.
The 18-year-old will wear the no. 20 shirt at the London Stadium. Upon completing his transfer, Cardoso said:
“I am very excited and it’s a dream come true.
“I always dreamt of coming to England and now I’m here at this big, historic club, so I’m very happy.
“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. I’m here to work and to help the team reach their goals.
Cardoso represented the Portugal U-19s in their quest for European Championship success this summer, where they reached the finals.
West Ham director of football Mario Husillos added: “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.
“Our scouts in Portugal have watched his development very closely for some time now and we are very happy to have secured his transfer.”
Cardoso, who made 15 league appearances for Boavista last season, becomes the fifth summer signing for Hammers following the arrivals of Roberto, David Martin, Pablo Fornals and Sebastian Haller.