Abdul Rahman Baba has reportedly signed a five-year deal at Chelsea
The Ghana international has joined the club for a reported £21.7million to replace left-back Filipe Luis, who left Stamford Bridge to rejoin Atletico Madrid earlier in the summer.
And Mourinho, speaking after the game at the Etihad Stadium, said: "It is important because he is a left-back. He can compete with (Cesar) Azpilicueta.
"At the same time Azpilicueta can compete with (Branislav) Ivanovic for the right-back position, so he replaces Filipe Luis in the balance of the squad."
While Rahman said on the deal: "I am very happy to sign for Chelsea, one of the biggest clubs in the world.
"I can't wait to train with my new team-mates and am very much looking forward to working with them and Mr Mourinho."
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