A graduate of West Ham's youth academy alongside the likes of Frank Lampard, Joe Cole and Rio Ferdinand, Carrick went on to win five Premier League titles under Alex Ferguson.
Carrick has been restricted to just four appearances in all competitions this term due to an irregular heart rhythm, which he was diagnosed with in September.
The Old Trafford club captain told a news conference on Monday: "There comes a time, wether you like it or you don't like it, that your body tells you it is time to stop playing football".
"It started in the Burton game and then happened again in training", Carrick said.
The midfielder has thankfully returned since but ahead of the Champions League last-16 clash with Sevilla he announced his retirement at the end of the season, but his time with the club won't be over just yet stating that it is "likely" he will join José Mourinho's backroom staff.
"It's kind of been sorted", added Carrick. It's something you have to accept. We're still talking about it, to be honest, so there's nothing to totally confirm as yet. Signed for £18 million, he has played 463 times for the Mancunians and also represented England 38 times, named in the Three Lions' squad to both Germany 2006 and South Africa 2010 FIFA World Cup tournaments but did not play a single minute.
Mourinho confirmed that Anthony Martial is back in contention after an injury of his own, and that Daley Blind, Ander Herrera, Marcos Rojo and Phil Jones remain absent.
"I had a few tests after that and the same problem came back on the Sunday of that week in training".
"I'm clear now, it took a bit of time to get over". At least I could decide and not be forced because of that, so I was determined to get back fit.