"The boss encouraged me to sign and indicated he would be here for at least that length of time.
"He said he wants to stay for a number of reasons. He wants to get United back to the top and to see the likes of Wayne Rooney, Cristiano Ronaldo and Darren Fletcher become world-class players.
"The manager also wants to win more trophies and make sure that when he does eventually go, he goes on a high."