Mourinho must choose between the highly-rated Belgian stopper or the experienced Czech international, but while he has admitted that it is not an easy situation, the Portuguese coach believes that it's good for the club to have two world-class goalkeepers in their squad.
The 51-year-old told reporters: "I think that it's not easy. I don't think any manager is happy to see one player not in a very happy and comfortable situation. But for Chelsea, it is a great situation."
Courtois played the full 90 minutes in Chelsea's final pre-season friendly against Real Sociedad, but Mourinho has insisted that doesn't mean that he will start the game at Turf Moor.