The Bayern Munich midfielder entered the final year of his deal with the Bavarians and has been linked with a move to Manchester United, FC Barcelona, and Real Madrid during the recent weeks.
, the midfielder returned to
pre-season camp as he featured ina 3-0 friendly defeat to Napoli on Saturday.
Asked for an update on his contract situation post-match,
told reporters: "I'm not involved enough that I have a say every day. I stay out of these issues.
"Of course I have talked to him about my plans for him. I've told him I'd be happy if he extended and I'm also confident. There are several topics involved when it comes to discussing a contract extension.
"I'll continue to focus on the sports side of things and show him he can be one of the most dangerous midfielders in Europe. He has potential to get even better."
Die Rotten has already signed
on free transfers, while
joined the club from RB Leipzig for £38 million back in February.
"I said before that I'm taking over a well-functioning team," he said. "I haven't had the full team yet. On Monday we will be complete when others return, and then it's about finding the rhythm in training.
"I'm not worried about these scores. I think the first half today was good. We had control and played well, but we didn't manage to create a lot of chances in the final third.
"Our task as a club is to always observe the market. We have a good squad, but we can always improve it. Every coach in the world wants the best possible team."