The Belgium worldwide has made a flying start to his Old Trafford career, scoring six times in his first six appearances in all competitions, and, on Sunday, comes up against former club Everton following his £75million switch from Goodison Park in July.
Mourinho also revealed that Luke Shaw has recovered from a foot injury, though he expects Marcos Rojo to remain sidelined for a "couple of months". Zlatan Ibrahimović is a third alternative. United enter the contest without Paul Pogba, who limped off the pitch against Basel and won't be fit for a few weeks. "Herrera, Fellaini, Carrick, they are waiting - they are waiting for a real chance to start matches and to play matches from the beginning, and they are ready".
Pogba is not expected to be back until after the worldwide break, at the end of October, with Marouane Fellaini - who scored after replacing Pogba against Basel - the likeliest candidate to be given his central midfield berth in the meantime. Rashford will be a handful for the Everton's defence and would be looking to pick up from where he left off in the Champions League after scoring on his debut.
Carrick is yet to start a game this campaign but at 36-years-old, Mourinho knows when the ideal time will be to use his wealth of experience and expert passing in midfield.
Long-term issues plague Yannick Bolasie, Ramiro Funes Mori and Seamus Coleman. You just have to respect the player's desire, and what they decide.
The Red Devils are now top of the Premier League table on goal difference after having taken 10 points from their opening four games.
Sunderland still have more Premier League away wins in 2017 so far (2) than Everton (1).
But after 28 goals in all competitions last season before being struck down by injury, Ibrahimovic is eager to resume playing football.
Mourinho added on MUTV: "That is an opportunity for others and the others are ready to get that opportunity, and to perform".
The match kicks off at 16:00 BST on Sunday and it will be broadcast live in the United Kingdom on Sky Sports.
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