United play at Ferdinand's old club West Ham tonight with a 15-point lead over Manchester City.
He said: "We've got to make sure we finish the season correctly and get this title back. We're not far off it but it's not over until it's over. We have to make sure we remain focused and apply ourselves in the right way.
"I'm not really surprised by the lead if I'm honest. When I look around the changing room I expect us to be winning games nine times out of 10.
"I believe in the squad, believe we can win games in various ways, winning ugly, playing fluent football, keeping a clean sheet.
"It would be great to win it again but until we do I don't want to talk much about it. Last season a lot of people got ahead of themselves."