Real Madrid have confirmed that Cristiano Ronaldo has suffered a thigh strain.

The Portugal star took himself off the pitch towards the end of the 3-0 win over Villarreal on Wednesday, clutching the back of his right leg.

Head coach Zinedine Zidane said he had no concerns that the injury could be a serious one, while Ronaldo himself took to Instragram to announce he was "all good" after the incident.

Madrid have now said that medical tests conducted this week have identified muscle damage, though they would not put an estimate on Ronaldo's recovery time.

"After the medical examinations conducted today [Friday] on our player, Cristiano Ronaldo, a the Hospital Universitario Sanitas La Moraleja, he has been diagnosed with a muscle strain in his right thigh," a club statement read.

"His progress will be monitored."