German central defender Mats Hummels extended his contract with German domestic double winners Borussia Dortmund on Sunday for another three years until June 2017, the club announced.

The 23-year-old - who is a member of Germany's Euro 2012 squad - said that he hadn't thought twice when Dortumund, who recorded a second successive title win last season and trumped it with victory in the Cup, offered him the extension.

"I didn't hesitate when the club proposed extending the contract, after all the success we have enjoyed and the huge amount of pleasure I have got out of it," he said.

Dortmund coach Jurgen Klopp was delighted Hummels had, like Brazilian central defender Felipe Santana last week, signed an extension.

"Mats could easily have left for other European clubs but instead he opted for Borussia, which I am delighted about," said Klopp, who highlighted his defensive and leadership qualities.

Hummels has been at Dortmund since 2008 after signing from Bayern Munich, where he had come through the youth system.