Luke Modric-Gareth Bale
Luke Modric and Gareth Bale have picked up injuries during Real Madrid's victory over MalagaGetty

Real Madrid manager Carlo Ancelotti has admitted star duo Gareth Bale and Luke Modric are doubtful for their Champions League clash against Atletico Madrid.

The Wales international was withdrawn in the fifth minute after he complained about a calf muscle injury during the 10-times European champions' 3-1 victory over Malaga. In the same match, the 29-year-old was substituted in the 60th minute due to a knee problem.

The first leg of the Champions League quarter final clash at Vicente Calderon ended in a goalless draw. The holders need a win in the second leg in order to progress to the last four of the competition.

The Italian manager claims Bale and Modric will undergo tests and then a decision will be taken on their involvement in the midweek Madrid derby.

"Modric had a problem with his knee, and Bale had an issue with his calf muscle. We are going to evaluate both players over the coming days. They are not completely ruled out for Wednesday. We have to do tests and then we will make a decision," Ancelotti explained.

"My optimism is not over whether they play or not, it is about the fact that we have a great opportunity to play in our stadium and we will give our best with Bale or without Bale. We are going to do everything we can to reach the semi-finals."

Modric has been the key player for Real along with Germany's World Cup winning star Toni Kroos in the midfield. The absence of the former Tottenham star, along with Bale could be a big blow for the defending champions.

Meanwhile, striker Karim Benzema missed the last league fixture against Malaga due to a knee injury. Ancelotti says the French international will be back for the second leg quarter final clash of the European competition.

"I think that he is going to play. His injury problem is improving. We have four days left and the chance to have him back fit," the former Chelsea manager said.