During the champions' home game against Aston Villa on December 12, United's betting partner will fill their advertising space with images of fans from around the world declaring their allegiance to Sir Alex's men.
Submit your photo and you could see it on the digital adverts around the Old Trafford pitch, or on the boards behind the manager and players as they are interviewed for TV.
Betfair's 'Get Behind United' campaign has never been done before and, as the game will be broadcast live around the world, millions of fans will see how much you love United!
One lucky fan will win the chance to appear on the interview boards and tens of others will be chosen to appear on the perimeter advertising boards.
For more information, to submit your photo and to read the terms and conditions, visit www.betfairfootball.com/getbehindunited.