But Moyes believes Fergie will make the right call.
He said: "Sir Alex is his own man and I'm sure he'll handle this right for Tuesday.
"Maybe he thought it was the right choice to leave out Rooney. Maybe he thought he wasn't playing that well and had to leave him out.
"It shouldn't all be on the crowd.
"Maybe he was making people realise that if you play for Manchester United you have to conduct yourself in the right manner and it doesn't matter who you are.
"I'm sure Sir Alex did what he thought was right."