West Ham have announced the signing Swedish-born Montenegrin midfielder Sead Haksabanovic.
The 18-year-old joins the Premier League side on five-year contract for an undisclosed fee from Swedish Superettan side Halmstads BK.
He becomes the club's fifth signing of the off-season following the arrival of Pablo Zabaleta, Joe Hart, Marko Arnautovic and Javier Hernandez.
Having represented Sweden at youth level, Haksabanovic then switched allegiances to Montenegro, and has since made one appearance, in a World Cup qualifier.
He scored four goals in 18 appearances in the Swedish Allsvenskan this season having made his debut for Halmstads at just 15.
Speaking to the club's official website, he said: "I'm really happy to be here – it's a dream come true.
"West Ham is a big club and it is a nice feeling to have signed. The move happened quite fast – we heard that they wanted me, so I was interested to hear the plan for me and when I did I was very pleased.
"I am an attacking player, I like to dribble and shoot, but I work hard for the team. I am really looking forward to getting started, I have watched quite a few West Ham games in the Premier League and I can see that they have some great players and great fans.
"Now I just want to get used to being with the team and then hopefully play some games at some point next season."
Part of a club statement read: "Everyone at West Ham United would like to welcome Sead to London Stadium and wish him the best of luck as he embarks on a new career in Claret and Blue."