The Spanish midfielder says that there are no easy games in this competition and that any team can beat any other side on their day.
Herrera goes on to say that United will be have to be at their best against West Bromwich Albion on Saturday.
"If we were talking about Spain, I could pick out games and say 'we need to win this one, or this one', but in this league you never know what will happen," the former Real Zaragoza and Athletic Bilbao man tells the club's official website.
"You could beat Tottenham and then come to Palace and not win, so you never know.
"You saw teams like Arsenal and Manchester City lose to Everton and Leicester City, for example, and then Leicester lost against Bournemouth. There are no easy games – this is the most amazing league in the world, and I just want to think about the next game.
"I want to win against West Brom; if you think you have to beat the next three or four teams, then maybe you won't do that. It's all about the next game."