Robert Lewandowski says he expects to be fit for Wednesday's crunch Champions League clash against Real Madrid despite injuring his shoulder in Bayern Munich's 4-1 thrashing of Borussia Dortmund.

Lewandowski has scored 38 goals in all competitions for Bayern this season -- seven in the Champions League -- after he netted twice in Saturday's win over Dortmund to leave him with 26 Bundesliga goals this season.

But having converted a second-half penalty, Lewandowski went off on 72 minutes and was clutching his right shoulder on the way to the Bayern bench.

However, the hot-shot is confident of facing Real.

"We didn't want to take a risk. The shoulder is bruised, but it's not so bad," Lewandowski told Sky when asked why he came off.

"I hope that I will be 100 percent fit for Real."

Bayern winger Arjen Robben admitted there were concerns Bayern might face the Spanish giants without their star forward.

"I asked him what the matter was and he just said he had pain in his shoulder," Robben said.

"I just hope he's okay for Real Madrid, because we need him and his goals."

Bayern host holders Madrid in the Champions League quarter-final first leg on Wednesday with the return leg in Spain on April 18.

"He had a contusion in his shoulder, which is painful right now, but we think he will be ready for Wednesday, which is the most important thing," added Bayern coach Carlo Ancelotti when asked about Lewandowski.

Veteran wingers Robben, 33, and Franck Ribery, who turned 34 on Friday, also scored for Bayern in a win which left Ancelotti's side 10 points clear at the top of the Bundesliga and on course for a fifth straight title.