Borussia Dortmund chief Watzke denies Bayern Munich agreement for Man Utd target Lewandowski
The Pole is also wanted by Manchester United.
"It's just a bubble of speculation," Watzke said. "There is absolutely zero substance in the reports, there's is not even a primary source - that really gets on my nerves.
"The fact is, Robert has a contract with us until 2014 and we want to extend that."