Borussia Dortmund could take a gamble and keep hold of Robert Lewandowski even if he opts against signing a contract extension, according to club chief Hans-Joachim Watzke.

Lewandowski, 24, has a contract until June 2014 at Signal-Iduna Park and it is almost certain that his deal will not be extended as the player is looking for a new challenge.

Borussia were, therefore, widely tipped to sell the Polish striker at the end of the season, but club CEO Hans-Joachim Watzke admits they may resist the temptation to do so.

“It is a simple numbers game. It could make financially more sense to play a good season with Lewandowski instead of selling him and receiving a high transfer fee,” Dortmund CEO Hans-Joachim Watzke told kicker magazine.

“We are under no financial pressure to act on this.”

Lewandowski is widely regarded as one of the most prolific strikers in Europe and has been heavily linked with a move to Old Trafford in the past.

After his 22 league goals helped Borussia Dortmund win the Bundesliga title last term, the Poland international continued where he left off, netting 9 times in 12 league appearances this term.