Writing on LinkedIn, Brown said: "So after 23 years of loyal service, my time has come to leave Manchester United, not by choice but via a redundancy program. Not the way I had dreamed, but these things are sent to test us. I have enjoyed some of the most fantastic times, met absolute legends of the game, and been part (only a small part) of some legendary moments.
"Not sure what doors will open or what path to take at 52, but I will keep knocking on doors. I would like to think that my skill set is suitable for recruitment and would love to follow that route. Any ideas would be gratefully appreciated.
"I wish Manchester United all the best for the future. It has changed so much in 23 years, some good, some not so.
"Don’t lose the soul of the club to save a few quid. The people who were there made it such a special place, rich with history. Onward to the next chapter."