Borussia Dortmund general manager Hans-Joachim Watzke has declared Robert Lewandowski is off the market.

Having refused to do business with Bayern Munich over the Poland striker, Watzke says Manchester United and Chelsea can also forget about trying for him.

"Robert will definitely be playing for Borussia Dortmund next season," he told Suddeutsche Zeitung.

"We need this security to be able to plan (for the season)."