If Manchester United or Arsenal are to sign Kevin De Bruyne from Wolfsburg, they have to make an offer of more than £30m.
The 23-year-old would prefer to stay in the German Bundesliga but sporting director Klaus Allofs admitted that the player is wanted by a large number of European clubs.
"I am quite sure he will play here next season," Allofs said.
"Maybe after the DFB-Pokal final we will sit down with Kevin and improve his contract length [which currently runs until 2019] and salary.
"Of course the interest from other clubs is scary sometimes, such is the volume and intensity of it.
"It doesn't worry me that Kevin doesn't state he will stay, there is mutual trust between us."
Asked about a possible move to Bayern Munich, the youngster told Bild: "If Bayern are interested then they should get in touch with Wolfsburg.
"They will make the decision as they are responsible for my future.
"All I know about interested clubs is from reading newspapers. I have not spoken with any clubs as of now. However, I cannot say I'm definitely going to stay here this summer.
"I think fans are better treated when players are honest with them, rather than for me to swear my eternal love to Wolfsburg then disappear."