The 28-year-old is out of contract in 2020 and is yet to commit to a new deal.
German international Gundogan said: "There is no decision yet, otherwise I would have signed or I would have rejected a contract. I would say we are still in talks but I don't feel that there is much pressure.
"Everyone feels different, maybe someone feels like a new challenge or to change something. I am always open-minded for challenges. It's a personal situation. It's not obvious, but everyone has to make their own decision.
"At the moment I try to play as good as possible and I guess after the season we will sit and talk again. My main target at the moment is to go for all the competitions and be successful.
"In the last few years especially, after coming here with a big injury, I have proved that I can play in England for more than two or three years. That shouldn't be an issue at all."