Portugal begin their Euros title defence with Ronaldo fit and available.
Mourinho said: "In the Portuguese team the problem will arise when Cristiano leaves.
“Right now, he's the leader, the main man, the one who attracts all the attention.
"The difference in status with the others is so great that I think there is not a single player on the team who would like to be in a different situation. They feel protected by Cristiano's aura and this is good for the team."