Borussia Dortmund chief executive Hans-Joachim Watzke has reiterated that the club will not sell Robert Lewandowski in the summer.

The Poland international striker has been linked with a move away from the German club, with Bayern Munich and Manchester United reportedly keen on him.

"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.

"After winning two championships and going through to the Champions League final, we have reached a status where we expect every player to unconditionally commit to the club."

Lewandowski has scored 23 goals in the Bundesliga and 10 in the Champions League this season.