Carrick has seen his playing time this season limited after having gone minor surgery to correct an irregular heart rhythm. "That is where I am at", Carrick said, as reported by the BBC.
'Good luck to my good friend Michael Carrick who is retiring at the end of the season, ' he posted.
"It s kind of been sorted", added Carrick.
United last hosted a Champions League knockout game in 2014 and skipper Carrick says it is high time they competed again for European football's top trophy.
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"There comes a time when as much as you don't like, it's time to stop playing football", Carrick confirmed, quoted by the Press Association's Simon Peach.
The 36-year-old midfielder has played sparingly for United this season, after a heart scare earlier this season.
The the 36-year old former England global, made the disclosure while fielding questions from journalists ahead of his teams Champions league second half clash against Sevilla. We're still talking about it, to be honest, so there's nothing to totally confirm as yet.
'Obviously, I had the problem in the Burton game, when it started during the second half, and then had a few tests after that, ' he told the media ahead of tomorrow's game.
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"But that quickly passed, and I got back fit and I wanted to finish on my own terms, really, where at least I could decide and not be forced because of that".
"I'm clear now, it took a bit of time to get over. I am trying to help a lot more because I understand where I am at".
After two seasons at White Hart Lane, he secured a move to Old Trafford, where he went on to win five Premier League titles and the Champions League and became club captain following Wayne Rooney's departure to Everton in the summer. So far this season, the midfielder has been restricted to just four appearances because of cardiac arrhythmia.
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