United upped their game yesterday as they demolished Leicester 4-1 at Old Trafford.
And with captain Wayne Rooney dropped to the bench, Herrera, Pogba and Juan Mata shone in a midfield triangle.
But Neville still thinks the trio have got to prove themselves before they cement their places in the starting line-up.
He told the Gary Neville Podcast: “Today it worked. It's too early to say, I don't think Mourinho will look at that performance and think Pogba and Herrera are his midfield two for Manchester City at home, or Liverpool away or Chelsea away.
“They still have to build up that trust to him, to us, the crowd, that they are good enough to play in these big matches.
"United have got three games in the next six that are against Chelsea, Liverpool and City.
“In those games Pogba and Herrera, if they are going to play together, can they then go and deliver in the bigger games and against the better opposition?
“When you've got Coutinho playing in the hole and pockets behind you, you've got Silva, De Bruyne, Hazard, Oscar and players like that.
"That's when the ultimate test will come. But it's a good start for them today. They took their opportunities."
United raced out of the gates yesterday to score four goals in the first half and put the game out of reach.
Mata and Pogba both got their names on the scoresheet as the Spaniard also added an assist for Marcus Rashford’s goal.
Mourinho will now have to juggle his squad as United take on Zorya Luhansk in the Europa League on Thursday before hosting Stoke in their next league game.
