Frankly ridiculous how Rafael is there. "Lots" of other good options too, but for me this would be it:
1. Schmeichel, Giggs, Scholes, Keane, Best and Cantona have to be in. This means no Beckham, Charlton, Rooney, Neville, Ferdinand, Foulkes, Robson or Evra.
2. Missing the entire back four. Buchan can go in here, taking Law out of the equation. Vidic partners up with the scot. Valencia for the right, and for the left... shit. Maybe Evra and Cantona leaves the team?
3. Midfield. Let's use a 4-3-3. Moving on...
4. Attack. Ronaldo joins Best. Only missing a centre forward... Cantona could lend a hand, so could the already mentioned Law and Mark Hughes, but there are plenty of good options left. Solskjaer, Van Nistelrooy, and a few others. Solskjaer clearly wins in regard to honours with the club, and was a fan favourite.
Ronaldo Solskjaer Best
Giggs Keane Scholes
Evra Buchan Vidic Valencia
Schmeichel
For balance's sake Cantona had to leave. Or maybe a 3-4-3...
5. Evra out. Stam has to come in for the third spot.
6. The three from before remain. Valencia goes higher on the pitch, Giggs on the left.
7. Attack sees Cantona replace Solkjaer.
Ronaldo Cantona Best
Giggs Keane Scholes Valencia
Buchan Vidic Stam
Schmeichel
This could work... how about a 3-5-2?
8. Hum, not really... taking one of the forwards for somebody like... Park, Mata or even Anderson would be a step back.
9. Final lineup. Cantona changes the club and the fans in ways Evra never did. For that, it's worth the risk of having a very attacking Giggs as all rounder on the left, and using a not so usual formation for United.
Ronaldo Cantona Best
Giggs Keane Scholes Valencia
Buchan Vidic Stam
Schmeichel