Campbell will always remember the day Sir Alex instilled discipline into him and his fellow United trainees.
Campbell, 26, said: "When Sir Alex was there, all the young lads would be brought in on the first day and he would tell the players how the club is run and what he expects of professionals.
"Right at the end of the meeting he picked me out and said, 'Fraiz, can you go over to the cupboard and get that box out?' I got the box out and gave it to him and he pulled out a massive sword.
"He said, 'If any of you misbehave then I'll have to get the sword out!'"
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball