Real Madrid defender Pepe has admitted that he is 'doubtful' for Portugal's World Cup qualifier against Russia on Friday.

The 29-year-old picked up a knock in Sunday's 2-2 draw with Barcelona, but he has revealed that Cristiano Ronaldo should be fit to start.

"The match against Barcelona was very tiring. Cristiano has more chance than me to be fit for Friday's match, but I am going to do everything within my power to recover in time," Pepe told reporters.

Pepe has 46 international caps to his name.