The Red Devils' coach slammed his Manchester rivals by claiming that the team are not "well-balanced".
"Look at the season we have had, and winning the FA Cup last year," Milner told the Manchester Evening News. "That first trophy as a group was great, and you can look at games this year when we have been losing and shown character and fight.
"Even in the FA Cup game against United, we were a man down and losing heavily at half time. But we came back and could easily have got a draw. I can't see a team of individuals doing that.
"You need that spirit, determination and togetherness to get through the low points of the season, and we have done that."
Meulensteen also hit out against Mario Balotelli by stating that the controversial Italian striker would have "no chance" of getting into the Man United squad.