"There's great rivalry between United and Liverpool, so it was a big result for us, especially with how tight the league is," he told MUTV.
"We knew that if we got three points then it would put a bit of space between us and Liverpool.
"A draw would perhaps have been a fair result, but we defended really well and managed to get the goal.
"(Nemanja Vidic) Vida and Rio were brilliant for us. I think Rio is probably the best defender in the world at the moment.
"He's been doing really well for us. The whole defence and the whole team is defending well."