The versatile Spaniard's future has been the subject of speculation all summer, with Bayern reportedly willing to offer €40m (£31.7m) for him, and has said that he is happy with the attention.
"It's truly great to have so much interest from Germany," said Martinez.
"I know the German press and fans are very interested in who I am. I can't say much else [about a transfer] though. I'm just relaxed and training training, trying to stay in shape and wait for a decision. I cannot do more than that."
Martinez was part of the Spain squad that won Euro 2012.