United have hit form at the right time with six wins and a draw, against champions Leicester, in their last eight games.
But the Reds have not won three straight league games since September although Van Gaal insists his side is capable of winning all four remaining clashes.
He said: “We are always able to do that, I think.
“I don’t know if we did won three in a row in the Premier League in September, October or November, but we are always able to do that. That’s my belief, because of our quality.
“And quality is not only mental strength, it’s also quality as a player, as a team.