Bayern Munich's Robert Lewandowski is doubtful for next Wednesday's Champions League semi-final at Barcelona with a fractured cheek-bone from their cup defeat to Dortmund while Arjen Robben's season is over.

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Lewandowski, who has scored 23 goals this season, spent the night in hospital with concussion and also a broken nose after a goal-mouth collision with Borussia Dortmund's Australia goalkeeper Mitchell Langerak late in extra time of Tuesday's 2-0 German Cup semi-final home defeat on penalties, the club has confirmed.

"It's a few more days till the match at Camp Nou, I really hope I will be able to play!" Lewandowski wrote on his official Twitter account on Wednesday.

The 26-year-old could still line up against Barcelona at the Camp Nou on May 6 by wearing a special mask before the return leg in Munich on May 12.

"How long he (Lewandowski) will be out for will only be known after a more detailed examination," said Bayern in a statement. Having missed the last five weeks with torn abdominal muscles, Dutch winger Robben, who has scored 19 goals, is now out for the rest of the season having lasted just 16 minutes in the second-half after coming off the bench as it finished 1-1 after extra-time in Munich.

The 31-year-old Dutchman limped on crutches from the stadium with a tear in his left calf and Bayern has confirmed his season is over. He will be treated on Thursday in the practice of former Bayern doctor Hans-Wilhelm Mueller-Wohlfahrt, who quit the club earlier this month.

There was some good news for Bayern coach Pep Guardiola as midfielder Thiago Alcantara is not injured despite coming off in the second half with a bruised foot.

Their cup semi-final defeat shatters Bayern's dreams of repeating their 2013 treble of European, cup and league titles having won the Bundesliga title last Sunday. Robben joins Franck Ribery, David Alaba and Holger Badstuber on Bayern's injury list.