Sir Alex Ferguson's men are 15 points clear of nearest rivals Manchester City and would break the division's record points tally if they win all of their remaining games, leading the Hammers boss to hail the Red Devils vintage as possibly their best ever.
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"It is pretty scary what total they might actually finish with. They have been outstanding and their squad rotation has been Sir Alex's masterpiece, as usual - about playing the right team at the right time."
The 58-year-old feels that United's early exits from other competitions were a big factor in helping them surge to what is set to be their 20th English crown.
"They have not had the normal focus on three or four competitions almost to the end - the focus has come on the Premier League, and they have just breezed it - everyone else can't get near them," he observed.
"We will need to be on our best form, as always, if we are to get anything but we have run them close three times this season.
"I would say we are still another couple of points off being absolutely safe. Hopefully we can win a couple of matches and see where we go."