Earlier in June, international sports media reported that Ronaldo, who is both Portugal's most capped player and all-time leading goalscorer, wants to leave Spanish giants Real Madrid this summer after nine seasons at the club.

"I don't have any negative comments on this matter. He is focused on playing for the Portuguese national team at the World Cup and he will help us pursue our ambition," Fernandes said when asked if Ronaldo's decision to leave his club could affect his performance for his country.

Ronaldo, who is set to captain Portugal at the World Cup, has scored 81 goals in 150 matches for the national team.

 Reigning European champions Portugal will kick off their World Cup campaign with a match against 2010 World Cup winners Spain in the Black Sea resort of Sochi on Friday before also facing Morocco and Iran in their other two Group B matches.