Borussia Dortmund confirmed on Sunday they have signed Germany international Gonzalo Castro from Bayer Leverkusen for around 11 million euros ($12.1m) on a four-year-contract.

"We are delighted to have signed in Gonzalo Castro an experienced, technically skilled midfelder, who can play in different positions," said Dortmund's director of sport Michael Zorc.

The deal has been possible due to a clause in Castro's contract which ran until June 2016, but allowed him to leave for a fixed sum.

The 27-year-old, who won the last of his five caps for Germany in 2007 and joined Bayer in 1999, had been on the wish list of Dortmund's in-coming head coach Thomas Tuchel, who takes over from Jurgen Klopp next season.

Castro, who has scored 25 goals in 286 league appearances, can play as a defensive midfielder or in defence.

He will replace former captain Sebastian Kehl, who is retiring, and Ilkay Gundogan, who is expected to leave Borussia after turning down a contract extension.

Dortmund finished seventh, rounding off their league campaign with a 3-2 win over Werder Bremen on Saturday, which was no mean feat as at one point they were in danger of battling against relegation and have qualified for next season's Europa League.

They play Wolfsburg in the German Cup final on Saturday at Berlin's Olympic Stadium in what will be Klopp's swansong after seven hugely successful years in charge of Dortmund.