While the former Arsenal winger has signed permanently for Werder, it's been claimed Bayern have an option on the Olympic silver medalist.
Lemke, reports Sport1, has stated there is an understanding with Bayern, which could see Gnabry move to Munich as early as June.
Werder chief Frank Baumann has denied the reports, insisting: "There are no agreements with other clubs. We bought Serge Gnabry - I am surprised by the Bayern rumor."
But Lemke coyly says: "I find it very clever and very creative, what Frank Baumann has said here. I find it totally cool, how it has all been treated."