Lewandowski has long been courted by the likes of Bayern Munich and Manchester United after another impressive season with the Champions League finalists, and his agent has admitted the Pole is likely to move on this summer, with the Bundesliga champions leading the chase for his signature.
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"Our desire is still that he will play for us at least one more year until his contract runs out [on June 30, 2014]," he told Suddeutsche Zeitung.
Dortmund have already lost star playmaker Mario Gotze to Bundesliga champions Bayern after they matched his €37 million (£31.5m) release clause, and Watzke has made it clear they will not offer players the same such deal in contracts in future.
He added: "After winning two championships and going through to the Champions League finals, we have reached a status where we expect every player to unconditionally commit to the club."