Updated

Arsenal completed the signing of midfielder Thomas Eisfeld from German side Borussia Dortmund on Tuesday.

Eisfeld, 19, had six goals and six assists for Dortmund's Under-19 squad this season. He has been in Dortmund's youth academy for seven years, and captained Germany's Under-15 side.

"Thomas is a player we have liked for some time," Arsenal coach Arsene Wenger said.