Cristiano Ronaldo injury: Real Madrid forward limps out of training and is now a doubt for Champions League final

The Portuguese forward threw his water bottle down in frustration as he walked down the tunnel

Cristiano Ronaldo limps out of Real Madrid training (Getty)

Cristiano Ronaldo has provided Real Madrid with an injury scare ahead of Saturday's Champions League final after suffering a thigh problem in training.

The Portugal forward hurt his left thigh when colliding with Kiko Casilla following a push from Dani Carvajal and, after receiving treatment on the field, threw a water bottle in anger as he headed for the changing rooms.

His participation against city rivals Atletico Madrid in Milan on Saturday could be in doubt, and it is a fresh worry for the club who are already without defender Raphael Varane due to a thigh problem that could rule him out of Euro 2016.

The Frenchman may be sidelined for up to three weeks with the injury sustained in training last weekend and, with France's campaign starting on June 10, could miss the tournament in his homeland.

Real Madrid coach Zinedine Zidane, the former France skipper, told the club's official website: "The only major drawback, and that really is very serious, is Varane.

Cristiano Ronaldo is assisted by the Real medics during training (Getty)

"He is now out for Saturday. He may not be ready in two or three weeks. It is less serious than we thought. He will travel but will not play on Saturday.

"With regard to the selection I hope he can play the Euros. It's a blow for him and I'm worried about him."