Beckham 8/1 to score free-kick
The bookies make the former Old Trafford star 8/1 to net with a free-kick, or alternatively 5/2 to get a yellow card, 33/1 to be sent off and 8/1 to receive a card for a challenge on England team-mate Wayne Rooney.
The 34-year-old faces Sir Alex Ferguson's side for the first time since leaving the Red Devils for Real Madrid in 2003.
And although the ex-England captain is not guaranteed to start the match, bookmakers have gone into overdrive with markets for the LA Galaxy man.
"The prospect of Beckham locking horns with Fergie has prompted a surge in interest. He remains one of the biggest draws in world sport and that translates itself into huge betting turnover," said David Williams of Ladbrokes.
United are the narrow 6/4 favourites for the clash in Milan, with the hosts at 8/5.
"We're laying plenty of United but would much prefer to be laying Milan. We'll be cheering on the Italians at this rate," he added.
Latest Ladbrokes betting:
8/5 Milan 6/4 United 2/1 Draw
David Beckham Specials
4/1 To score 5/2 To be booked 33/1 To be sent-off 8/1 To be booked or sent-off for a foul on Wayne Rooney 50/1 To score an own goal 8/1 To score a free-kick 6/1 To score from outside the box 33/1 To score a 2+goals 33/1 To score a header 12/1 To hit the woodwork 100/1 To score from inside his own half