Man Utd boss Ferguson sees Carrick as their most important
He explained: "I think Michael Carrick is the key to it. He did really well in the second half of last season and I think he's going to be the key man.
"They will all play a part - but, for me, Carrick is the key player.
"If you look at the central midfielders in the Premier League, he can match up against any of them in terms of quality."