When some players reach the top, coming back down the ladder is an almost impossible thought.
As players get older, some will realise that they'll naturally need to take a step down in order to prolong their careers, but not Michael Carrick, who has hinted that he may retire when his contract expires at the end of the season as he would struggle to play for another club.
The 35-year-old is in his 11th season at Old Trafford, and though Mourinho recently claimed that he regretted the former England man wasn't getting any younger, he did hint that those retirement plans may have to be put on ice for the time being.
And while Carrick is at ease with where he is in his career, he did admit that he's not given much thought as to playing for another club.
The likes of Ryan Giggs, Paul Scholes and Gary Neville all saw out their careers as United players, but the likes of Rio Ferdinand, Nemanja Vidic and Patrice Evra all sought to carry on elsewhere after lengthy spells in Manchester, all to mixed results.
And when asked what his next move would be he responded: "It is not something I am looking to do at the minute - it would be very difficult to play somewhere else," via the Daily Mail.
"Everyone is different. It depends on circumstance. It depends on a lot of things.
"I have said all along, I am relaxed about it (his future at United). It depends if I am playing and if I am playing well enough, if I feel I can contribute, if the manager feels I can contribute. There are a lot of things to be decided. I am quite relaxed."
Carrick remains one of the few United players to have been at the club during Sir Alex Ferguson's reign, and has since played his part for David Moyes, Louis van Gaal and Jose Mourinho.
So far this season he has featured just nine times across all competitions, but has generally earned praise for his performances when he has featured.
Overall, though, Carrick has made a total of 428 appearances for United, scoring 24 goals. He has lifted five Premier League titles, a Champions League, and an FA Cup during hit time there.
But he insisted that he is as hungry as ever to win silverware as United booked their place in the semi final of the EFL Cup this week.
"You can't beat that buzz of winning a big game,' he added. 'That is what keeps you going, having success and winning trophies. That is what I am here for."