Real Madrid star Cristiano Ronaldo has been ruled out of their Champions League double-header against AC Milan.

Ronaldo suffered a new ankle injury in Portugal's 3-0 World Cup qualifying victory over Hungary.

Tests have now revealed the injury is worse than at first thought, as Real medical staff confirm he will be out for three to four weeks.

"After a clinical examination and an MRI scan, it is confirmed the player has suffered a recurrence of his injury to his right ankle, a medial collateral sprain with inflammation in the bone," explained a statement.

"The estimated recovery time is three to four weeks."

This means Ronaldo will miss both the Group C encounters with Milan, which could well be decisive for qualification.

The Rossoneri travel to the Bernabeu on October 21 and then welcome Real to San Siro on November 3.