"We conceded a sloppy goal and then went behind, but we showed great resilience to come back into the game."
The veteran Dutchman insists it was imperative United avoided defeat and maintained a three-point lead over Chelsea at the top of the table.
"A draw is not bad but losing was out of the question," he said. "We want at least a three-point difference between us and them before we go to Stamford Bridge.
"The boss has already said it's going to be very tight - it's a three-horse race. Arsenal visit on Sunday, but Chelsea have a difficult run-in and it's not certain that they'll win all their games between now and the end of the season."