Both Ramos and Ronaldo play for Spanish giants Real Madrid.

"I like to play alongside [Ronaldo], not against him. We [Real Madrid] finished this season in great shape, he [Ronaldo] is a constant danger. Portugal has a great team. I will try to hold him back. And hope that the football fans will like this match," Ramos said.

Ramos also commented on Julen Lopetegui being sacked as Spain’s head coach on Wednesday, saying that football has “difficult moments that have to be overcome” and his role as a captain is to “motivate the team” no matter what.

2010 World Cup winners Spain will face reigning European champions Portugal at Sochi's 43,000-seater Fisht Stadium on Friday, before playing Iran and Morocco in their other two Group B matches.