Gareth Bale has emerged as a doubt for Real Madrid's Champions League semi-final first leg against Bayern Munich at the Bernabeu on Wednesday.

The Welshman, who scored the winner in the final of the Copa del Rey last week, missed a training session with Los Blancos on Monday through illness.

According to Football Espana, the former Tottenham Hotspur attacker has come down with a 'flu-like illness', which could rule him out of the European affair against Bayern.

Cristiano Ronaldo, however, completed the session and is expected to return to the XI.

Sami Khedira and Marcelo, meanwhile, are both still on the sidelines.