The Poland international has gone back on his earlier comments that a move to Bayern will be made official in 2014
The Poland international, 25, stated earlier this week that he will officially sign a deal with the Bavarians at the start of 2014, but he has now insisted that he has yet to make a final decision about his future.
"I was a bit shocked after I saw the video of Tuesday's interview. I only wanted to make clear that I cannot sign a contract anywhere until January," Lewandowski told Sport Bild.
"My only intention was to answer the question about when I would clarify my future.
"Like I've already said before, I intend to leave BVB in the summer. I cannot say anything else about it until January."
Lewandowski's contract with Dortmund is due to expire in June 2014, allowing him to open talks with other clubs over a free transfer come January.
However, it is against Fifa regulations to hold talks with other clubs until six months before the expiry date of a contract.