Moses helped set up their quarter-final clash with United by scoring in their midweek fifth round win over Middlesbrough.
Nigerian international Moses is relishing the trip to Old Trafford next week and believes if they can overcome the Premier League leaders they can go all the way and lift the trophy at Wembley.
"It's certainly not going to be an easy game," said Moses.
"Everyone will be expecting them to win, but we're really looking forward to it.
"Of course, they have quality players all over the park, but we have to concentrate on ourselves.
"We have quality in our side too and if we play together as a team, which we have done at times, I really can't see anyone stopping us.
"They're probably the best team left who we could have drawn but if we can beat them, then we can win the cup."