Arsenal have signed midfielder Thomas Eisfeld from Borussia Dortmund on a long-term contract.
Eisfeld, 19, can play in several positions and was part of Dortmund's academy for seven years. He has captained Germany's under-15 team.
Arsenal manager Arsene Wenger told the club's official website: "Thomas is a player we have liked for some time.
"We've watched him closely this season, where he has excelled for Dortmund's youth team."
Eisfeld has scored six goals and produced the same number of assists in his 12 appearances for Borussia Dortmund's Under-19s this season.
He said: "It's a real honour to be team-mates with the great players at Arsenal, and also training every day with players like Tomas Rosicky - who I grew up watching play at Dortmund.
"I will give it everything I have here and do my best to make the manager, players and fans happy."
Wenger added: "He is young but has proven to us that he can play, that he has the attitude and technical ability to be a valuable addition to our squad."