Thibaut Courtois’ father expects Chelsea to decide the fate of current No. 1 Petr Cech before the young Belgian commits his future to the club.
Courtois Jr is currently on loan at Atletico Madrid, where he has spent three seasons playing in La Liga, and is yet to make an appearance for Chelsea despite having joined in 2011.
The relationship between Jose Mourinho and Courtois Sr has been stretched in recent months, with the Chelsea boss reportedly wanting the goalkeeper to sign a new, long-term deal at Stamford Bridge.
However, the Courtois camp has been reluctant to pen a new contract with Chelsea without a reassurance of first team football - and Courtois Sr has suggested Cech's future must be considered first before anything is decided for his son.
"Chelsea have a good goalkeeper in Cech, so cohabitation with both is not possible," Courtois Sr told Belgian news agency RTBF. "Alternating between the two is possible on paper but this is not what we want. This is not a situation we want.
"For now, we expect to discuss with Chelsea but it is impossible for Courtois to join a club to be their number two, and the conclusion is the same for Petr Cech.
"Every week he dazzles us. He produces big performances and his team continues to amaze and produce good results, in part thanks to him. This is a big success. It goes beyond our expectations.
"He is very happy. He does not bother about tomorrow, and plays it game by game and works every day to improve. He is happy to be appreciated by his teammates and the staff."
Mourinho recently ruled out the prospect of selling Courtois to Atletico; his comments were later dismissed by Atletico director Clemente Villaverde, who claimed Mourinho did not make the transfer decisions at the club and that he would pursue above the manager's head in order to sign Courtois permanently.