The Belgian stopper, who is considered as one of the brightest and best keepers in world football, helped La Liga leaders Atletico eliminate Spanish rivals Barcelona in the quarter-finals, but he looks set to miss the season-defining semis due to a clause in his contract.
The 21-year-old is currently in his third season on loan from Chelsea, and although UEFA rules stipulate that there is nothing stopping Courtois from featuring against his parent club, Atletico may be priced out of such a situation.
Chelsea inserted a clause into the loan agreement at the start of the 2013/14 campaign which would force Atletico to pay a fee, reportedly as much as £4.95 million, should they opt to field their number one against them.
However, if the two sides are drawn together then it is unlikely that Courtois will feature – meaning that he will miss the most important match of his promising career to date.
According to Atletico president Enrique Cerezo, the capital-based side are not in a position to pay such a fee and would be forced into fielding 34-year-old Dani Aranzubia, who has played just once this season.
Speaking to Spanish radio Onda Cero, Cerezo said: "It is a figure that we cannot pay."
- Sports & Recreation