"The front three (Liverpool) have got have been playing together for ages, and you can see the rotation movements and understanding," said the United boss ahead of Sunday's clash at Anfield between the two rivals.
"We hope our front three will get that understanding.
"I think I've only started them together once in the Premier League (against Newcastle) so we've got a way to go to get the understanding, but they scored four goals in that game.
"I believe in ours. We're going to add to them definitely, but in years to come we'll see lots of them.
"We've got them on long contracts and can see them three developing into a very exciting front three.
"I was here with (Cristiano) Ronaldo, (Carlos) Tevez and (Wayne) Rooney that's what we want as supporters and manager – express yourselves and put fear into their defenders.
"Liverpool have scored more goals than us outside the front three, so I'm not going to say ours are better or theirs are better. Sunday will be a game by itself."