The Brazil legend is confident the Colombia star would be the perfect signing for his former club, should Carlo Ancelotti opt to pursue a move for the Monaco man
The Monaco playmaker has been in sensational form at the World Cup, and scored his sixth goal of the tournament as Colombia were knocked out of the quarter-finals 2-1 by Brazil on Friday.
The 22-year-old has been linked with a potential switch to Spain as a result of his performances and confessed he would prefer a move to Santiago Bernabeu, although Monaco have made it clear they will not entertain offers for the player.
Ronaldo, however, believes James would be an ideal signing for Carlo Ancelotti's side should they be able to persuade the Ligue 1 club to part with one of their prized assets.
"I've heard nothing about Real Madrid's interest in James. Let's see what happens. All the players are focused on the World Cup, maybe something will be announced after the Brazil game," the former Madrid star told Marca.
"I believe he would be a great signing for Real Madrid, which for me is the greatest team in the world. It would be a great combination."