West Ham have completed the signing of Cliftonville winger Sean Moore.
Moore, 17, has signed a three-year pro deal with the Irons and will initially be registered with the U21s.
"I started playing football when I was six, so it's pretty amazing to sign a professional contract at West Ham United," Moore told the club's website.
"I am absolutely delighted to join West Ham. It's a massive club, so it was an easy decision for me."
He added: "It's a family-orientated club too. I have heard nothing but good things about West Ham. I know Callum Marshall, Patrick Kelly, and Josh Briggs well, and they told me how good it is here and how much they have enjoyed it.
"It's clear there's a pathway to the first team from the Academy as well, which is important for young players such as myself. I would love to play for the first team one day.
"I'm hoping to make a good impression when I start with the U21s and hopefully do very well in east London."