West Ham United have completed the signing of former Charlton Athletic midfielder Diego Poyet.
The two clubs have agreed a compensation fee and the 19-year-old has joined the Hammers on a four-year contract.
Poyet told the club website: "I'm very happy to be here. It took me by surprise a little bit and it all happened very quickly.
"It's a great club to be at and I know a few of the boys here already. It was a no brainer to sign, I wanted to come out here to the training camp as soon as I could and I'm grateful that they've had me here.
"It's massive to come to a Premier League club. It's what I wanted to do - I wanted a new challenge and soon as I heard there was a chance of stepping up I had to take it."
The son of Gus Poyet added: "I played quite a few games last season with Charlton and I just want to push on now. Like any young player, the first thing you want to do is get into the first team.
"I need to show the staff, players and the gaffer what I'm capable of doing and maybe pushing my way in.
"West Ham is a great club with a lot of tradition, moving to a new stadium and everything, it was a no brainer for me because you never know if you're going to get that kind of chance again."