Gotze joined Bayern from Dortmund in a controversial move in 2013 when the current Bundesliga leaders activated a release clause in the player's contract.

The 23-year-old has struggled to make the expected impact in Bavaria, however, and he has spent much of the current season as a back-up in Pep Guardiola's side, raising suggestions he may be sold in the summer.

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If that were to be the case then Watzke says Dortmund would think about making a move, although he added that he did not want to fuel speculation by talking about a player who is under contract at another club.

"If he were to come onto the market, however, and if we were to receive a signal that he would be interested in coming back to us, then we would discuss it - of course we would," Watzke told Sky Sport Deutschland.

"We have the utmost respect for him, but we would also have to discuss whether it makes sense for us from a sporting point of view.

"Everything has changed since he left us."

Gotze starred for Dortmund in their 2011/12 title-winning campaign and was a key player in the 2012/13 season with 10 goals in 28 appearances before injury forced him to miss the end of the season, including the Champions League final against Bayern.

This season, Germany's World Cup-winning goalscorer has found the back of the net only once in 12 Bundesliga appearances.

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