Bayern Munich's director of sport Matthias Sammer said Sunday that only Robert Lewandowski himself will decide whether he plays against Barcelona in Wednesday's Champions League semi-final with a broken cheekbone.

"It will be decided by the doctors, the player himself and whether he can play with the mask," Sammer told German broadcaster ZDF.

"One thing is clear. No player in the world is so important, that you put his health at risk."

The 26-year-old Lewandowski, the German champions' top-scorer with 23 goals, sat out Bayern's 2-0 league defeat at Bayer Leverkusen on Saturday to try and get him fit for the first leg at the Camp Nou.

Lewandowski broke his nose, cheekbone and suffered concussion during a clash with goalkeeper Mitchell Langerak late in Munich's German Cup semi-final defeat to Borussia Dortmund last Tuesday.

Lewandowski's agent Cezary Kucharski said he will advise his client against playing if he is less than 100 percent sure about playing with a protective mask.

"I'll advise Lewandowski against playing against Barcelona if there is a risk," Kucharski told Euro Sport.

Sammer offered little hope that French winger Franck Ribery will be fit for the Camp Nou showdown while Dutch winger Arjen Robben is out for the rest of the season with a torn left calf.

"In all honesty, Ribery is rather a long way from making an appearance," Sammer said of Ribery, who has not played since March 11 with an ankle injury.