Arsenal have signed highly-rated Costa Rica forward Joel Campbell from Deportivo Saprissa, the Barclays Premier League club have confirmed on their website.
Campbell, 19, had been linked with a move to the Emirates for some time and has now completed his transfer after representing Costa Rica the the Under-20 World Cup in Colombia.
Despite his age Campbell already has six full international caps and becomes Arsene Wenger's fourth summer signing following the acquisitions of young defender Carl Jenkinson, Lille forward Gervinho and Southampton starlet Alex Oxlade-Chamberlain.
Campbell is not expected to feature for the Arsenal first team straightaway, but he told the club's official website he is looking forward to developing under Wenger's tutelage.
He said: "It is a dream come true to play for such a big club in England and I want to do well for myself and Costa Rica.
"I am ready, I am very happy to be here and I want to focus on doing well for Arsenal.
"Arsene Wenger is a manager of immense quality. He knows how to use youngsters' ability. I have been watching Arsenal play since I was a kid and I took this decision because I know I have a possibility to become a better player here.
"I'm good in one-on-ones and I am a player who knows how to score goals. I play forward and I can play on both sides.
"I am going to learn a lot from the players here because they are experienced players who are very skilled."