The Belgian has returned to Chelsea following three seasons on loan at Atletico Madrid and is expected to usurp the 32-year-old, but the manager is pleased with the situation
Cech has been Chelsea's number one keeper since arriving in the Premier League in 2004 but his position is under threat following Courtois' return to Stamford Bridge after three years at Atletico Madrid.
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Courtois has publicly declared his intention to be Chelsea's first-choice stopper during the 2014-15 season, putting him on a collision course with veteran Cech, who is in line to be axed by Mourinho.
However, the Portuguese claims he is pleased with the situation and believes the competition will benefit the club in the long term.
"To have Cech and Courtois means we have the best young goalkeeper in the world and one of the top-three or five most experienced keepers," he told reporters.
"For me and Chelsea, it's perfect. Maybe one of them won't be happy but the Chelsea supporters will be happy and they're more important than players.
"Of course, the window is the window, but I'm so happy with the situation.
"If we don't have good players, we're in trouble. I'm paid to make decisions and I'm really happy with the situation."
Chelsea open their Premier League campaign away to newly promoted Burnley on August 18.