Thibaut Courtois

Atletico Madrid president Enrique Cerezo has again put in doubt whether Thibaut Courtois will be able to play against Chelsea in the upcoming Champions League semi-final even though Uefa has ruled that any agreement between the two clubs over his eligibility to play was "null and void".

The Blues had inserted a £5m - £2.5m for each leg - clause in the loan deal last summer that saw Courtois move to the Vicente Calderon for his third consecutive season.

With Atletico declaring they could not afford to pay the get-out clause fee, it looked unlikely the keeper would feature in the semi-final against his original club until Uefa released a statement dismissing the agreement and gave the green light to Courtois to play without any compensation due to Chelsea.

However, Atletico president Cerezo has again put in doubt Courtois' participation in the crucial tie, saying that they will need to reach an agreement with Chelsea despite Uefa's clarification.

"I don't know how many times I've repeated it. Courtois is Chelsea's player. We're trying to get him on loan for another season. I think he'll end up playing against them, but only if we reach an agreement with Chelsea. We're gentlemen and we observe everything we sign," Cerezo was quoted by AS.

Questioned if Uefa might sanction Atletico if Courtois does not play, the Atlético chief said: "I don't know. I think he'll play, but with an agreement between both parties. If he doesn't play, [Daniel] Aranzubia will come in."

Chelsea has stated they have no intention of going against the Uefa position but some reports in Spain suggested that Jose Mourinho has been telling his inner circle that Courtois will not play in the tie unless Atletico Madrid pay £5m - or he will not let Courtois stay another season at the Vicente Calderon on loan.