The Germany midfielder moved to Spurs in January from Schalke.
“I think next season is going to be my year. I can’t wait for pre-season to start.
“It will be my first pre-season in English football and I plan to give it my all. I have settled in very well with the rest of the lads.
“It feels as though I have been at Tottenham a lot longer than six months.
“This is a great club and I can’t wait to try to help them into the Champions League.”