A virus sweeping through the Bayern Munich is threatening to derail the German club's title hopes.

Bayern manager Louis van Gaal confirmed that many of his players had been hit by the virus and expects more to be affected by it.

"We have a virus in the dressing room," he revealed. "That is bad for us. Many players are already ill and we expect more to fall ill in the coming weeks."

The Bundesliga club have vital matches coming up and van Gaal is worried his team will be under full strength.

"This is bad with the important games against Dortmund and Fiorentina (in the Champions League) coming up," he added.