Bayern are believed to be frontrunners but Bergwijn's agent Fulco van Kooperen says they won't wait forever.
"We have never, never said we are losing patience," Van Kooperen told ESPN.
"Bayern are a great and huge club and it's great they like Steven. They can take all the time they need."
Van Kooperen added: "On the other side, it's not a secret there are more clubs which like him."