With some players yet to get first-team minutes this season and others on the comeback trail from injury, the third-round fixture is the ideal setting for the United manager to test his squad's depth. We have what we have, and with a couple of injuries now with Pogba and [Axel] Tuanzebe, so we need some of the players that played [on Sunday] to play, and we need some of them on the bench, because we need to have a strong team.
Matic has been outstanding for the Reds since arriving from Mourinho's former club Chelsea during the summer, while Fellaini has made an excellent impact when starting or appearing as a substitute in recent weeks.
Last season, it was not until United's opening game in this competition that he made his first competitive appearance, before going onto play an important role for the remainder of the campaign - something Mourinho suggests he can do again.
He said: "It honestly is a dream come true for me to be playing in the first team, and playing against teams like Real Madrid. I never saw Fellaini playing so well". But, with Paul Pogba also now sidelined with a hamstring injury, Mourinho insisted the pair will get their opportunity to play and once again emphasised the importance of utilising the full strength of his squad. "That's a team, that's a squad, we can only play with 11 guys". For Carrick and for Ander, it's just patience because their time will arrive.
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"So he is in a team with these two guys who are playing absolutely phenomenally".
Manchester United will look to book their place in the fourth round of the League Cup when they take on Burton at Old Trafford on Wednesday night. They are going to be important players for us, for sure.
UNITED youngster Scott McTominay is due some good luck... after a bird pooed on his luxury Mercedes. Tickets are still available for all supporters - see manutd.com/tickets for details.