MUNICH - Bayern Munich has lost two key players one week before facing Barcelona in the Champions League semifinals.

Winger Arjen Robben is out for the season after tearing calf muscles in the German Cup loss to Borussia Dortmund, while striker Robert Lewandowski has facial fractures.

Bayern could not say how long Lewandowski will be out, pending more medical tests. The Poland striker expressed hope he could be ready for the match in Barcelona.

"There are a few days until the match at Camp Nou. I really hope that I can play," Lewandowski tweeted.

Bayern lost Tuesday's semifinal in a penalty shootout when the cupholder's first four kickers failed to score. The match ended 1-1 in regulation time.

Robben was a second-half substitute, after missing five weeks with an abdominal injury. His comeback lasted only 16 minutes as he hobbled off late in regulation.

Lewandowski, who scored in the first half, was slammed from behind by Dortmund goalkeeper Mitch Langerak when he went off the line to punch away a cross late in extra time.

Lewandowski took a long time to get up, and was wobbly when he returned, walking slowly on the field. He did not take part in the shootout.

According to Bayern, Lewandowski has a broken nasal bone, broken jaw, and concussion.

By losing the semifinal, Pep Guardiola's team failed in its bid to repeat the 2013 treble under Guardiola's predecessor, Jupp Heynckes.

Bayern secured its third straight Bundesliga title on Sunday.

"We have to pull ourselves together now and go out in Barcelona with a new spirit, new energy," Bayern chairman Karl-Heinz Rummenigge said.

Captain Philipp Lahm, who slipped and missed Bayern's first penalty in the shootout against Dortmund, said the loss had to be put behind quickly, and "we'll have to look ahead."