Borussia Dortmund are signing permanently on-loan Real Madrid midfielder Nuri Sahin.

The Turkey midfielder is currently on loan with the Bundesliga club from Real Madrid until the summer, but agreement has been reached on a pre-determined fee for the move to become permanent.

"We informed the Real Madrid management of our intentions to take the option on him during our Champions League quarter-final tie with them," general manager Hans-Joachim Watzke said to the Ruhr Nachrichten newspaper.