Former West Ham United and Tottenham midfielder Carrick has won five Premier League titles and the Champions League during his time with Man United, and was handed the captain's armband a year ago following Wayne Rooney's departure.
Carrick underwent a routine procedure for an irregular heart rhythm this past fall, and thus hasn't been available most of the season.
"So that's pretty much where I'm at, which is fine".
Carrick said: "There comes a time when as much as you don't like it, it's time to stop playing football. It's something that you have got to accept".
Carrick will be hoping to add to his medal-laden CV before the end of the season - a campaign the veteran confirmed will be his last as a player before taking up manager Jose Mourinho's offer to join the coaching staff.
"For so long, it was kind of a given", said Carrick, the last remaining member of the victorious 2008 side. We're still talking about it, to be honest, so there's nothing totally confirmed as yet.
Carrick grew up near Newcastle but moved to West Ham aged 15, where he made his professional debut.
"I think it is quite refreshing to look at Scott and see how he deals with it", he said on the midfielder.
On whether he still hopes to play a part in the run-in after recovering fully from a heart problem earlier in the season: "Obviously, I had the problem in the Burton game, when it started during the second half, and then had a few tests after that". For two or three days I was thinking am going to carry on playing is it worth it but that passed and I got fit.
"I understood that I wouldn't be playing as many games, but I've been training hard and trying to keep fit".