Carvalho limped out of the action in the first half at Reading on Wednesday night with a knee injury, and Mourinho is expecting to lose him for a long period.
He said: "I think I am going to be without Ricardo for a while but John Terry is back.
"I lose one central defender but I win another one. John was back in training today with no limitations. He trained for one-and-a-half hours with the reserves in a very competitive situation.
"He could have played tonight but I wanted to protect him. He is ready for the next game so Steve McClaren can drink some champagne tonight after that information."