Herrera's side outclassed Cameroon at a rain-drenched Estadio das Dunas yesterday thanks to a second-half winner by Oribe Peralta.
Cameroon, who limped home from South Africa four years ago without a point from their three games, face a repeat if they fail to beat Croatia next week before their final group clash against Brazil on June 23.
The Aztecs face the hosts, 3-1 winners over Croatia on Thursday, in nearby Fortaleza on June 17, but an opening day win means Mexico could afford to slip up and still grab one of the top two qualifying places.
Part of it, he said, was down to the sizeable Mexican support which he said will be repaid by battling performances from now on.
More From This Section
"The Mexico fans were unbelievable and I think there are going to be thousands of them in all the stadiums throughout," said Herrera.
"They've done the impossible just to come to Brazil to support us, selling their houses, cars and even pawning their grandmother's clothes!
He added: "There are tough matches ahead, but we're a well-organsied team, we're in sync with each other and I give thanks every day that I'm at the helm of this incredible squad.
"The lads will leave everything out on the pitch, every drop of sweat, to get the results we want.