Chelsea are one place and three points in arrears of United, who face both London challengers within a fortnight in April.
"But points will be dropped by the top teams. There is a long way to go and it makes it interesting now. It's going to be a really good, tight finish.
"It's like I said at the start of the season - I think it will go to the wire."
Ferguson was speaking at the launch of the Vodacom Challenge, a summer tournament held in South Africa which United will take part in this summer.