Spurs enjoyed the majority of possession against United and secured a point thanks to a stoppage-time equaliser from Clint Dempsey.
Ferguson believes that Tottenham will prove tough to beat for any side that comes to White Hart Lane this season.
He told Sky Sports News: "Tottenham were very committed and aggressive. They worked their socks off and you've got to credit them for that.
"They kept pumping the ball in the box and got their reward. We did so well at everything and we kept heading it out, the disappointment is not finishing them off.
"The game was of a high quality and played in a committed spirit by both teams."
Spurs have now taken four points from two matches against United this season.