The Polish striker is out of contract in next summer and has been strongly linked with a move to Bundesliga rivals Bayern Munich, with a pre-contract reported to have been agreed already.
Barcelona, meanwhile, have been linked in recent days with usurping that interest with a winter move.
Considering his situation, the player has chosen to make clear that his future is already determined as away from Dortmund, but that he will not clarify his destination until 2014.
“Do not call me anymore, I have already decided my future and I will announce it in January,” Lewandowski has told Sport Bild this week.
“Even though I feel at home in Dortmund, I want to experience something new next season.
“I will give everything for Dortmund until I leave, I will leave you with a title.”
- Bayern Munich