Borussia Dortmund on Thursday announced they had signed Nuremberg midfielder Ilkay Guendogan on a four-year contract as the German champions begin building their squad for next season.
The Germany under-21 star, who will join Dortmund next season, is reported to have cost the Bundesliga winners four million euros (5.8m US dollars).
"We have agreed in principle to a four-year contract," said Dortmund's director of sport Michael Zorc.
The 20-year-old Guendogan, who was born in Gelsenkirchen, the home of Dortmund's arch-rivals Schalke, has scored five goals in 24 Bundesliga games for Nuremberg this season.
"Ilkay is a fast and well-rounded player, he will fit perfectly into our style of football", said Dortmund coach Jurgen Klopp.
Guendogan is considered a good replacement for Turkey international Nuri Sahin, who is set to join Real Madrid from Borussia Dortmund, according to reports in the Spanish media.
A deal to transfer the 22-year-old midfielder "is well underway," the daily Marca said on Thursday.