MADRID (AFP) - Karim Benzema looks set to join Luka Modric and Gareth Bale on the sidelines for Real Madrid's decisive Champions League quarter-final, second leg clash with Atletico Madrid with a knee problem.

"After the tests carried out on Karim Benzema by the Real Madrid medical team, they have diagnosed a sprain in the medial collateral ligament in his right knee," the club said.

Madrid did not add how long the French international will be out of action, but Spanish media reported he has been ruled out of the return against Atletico.

Benzema suffered the injury during last week's 0-0 draw in the first-leg between the sides and subsequently sat out Saturday's 3-1 win over Malaga.