The 25 - year - old 's new deal will keep him at Allianz Arena until 2018 .
The Germany international says he could n't be happier to be prolonging his stay with last season 's treble winners .
The 25 - year - old 's new deal will keep him at Allianz Arena until 2018 , and the Germany international says he could n't be happier to be prolonging his stay with last season 's treble winners .