The 36-year-old is set to retire at the end of the 2017-18 season when the final contract of his playing career expires.
Carrick has scored 24 goals in 461 appearances in all competitions during his 11-year spell at Manchester United.
The former West Ham midfielder has won five Premier League titles, the Champions League, three League Cups, the Europa League and the FA Cup at Old Trafford.
The former England international was made the club captain at the start of the season but he has been limited to two appearances due to fitness problems.
Carrick is set to take up a coaching role at Manchester United when he hangs up his boots following the conclusion of the 2017-18 season.
The veteran made his second appearance of the campaign in a 4-0 win over Yeovil Town in the FA Cup fourth round on Friday night.
Speaking at his news conference after Manchester United’s win against the League Two outfit, Mourinho opened up about Carrick’s performance.
“It’s fantastic to have Michael Carrick back,” Mourinho said.
“It’s really sad when you think, in May, his career is going to end as a player. But it’s a fantastic assistant-coach I am going to have, I believe.
“I want to help him be better and better but it’s a pity to lose a player that does everything well on the pitch.”
Manchester United are in second place in the Premier League table but 12 points adrift of current leaders Manchester City.
The Red Devils won the League Cup and the Europa League last term.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news