Herrera revealed the players have vowed to continue the attacking displayed for Monday's defeat to Tottenham.
He told manutd.com: "I was talking to Romelu [Lukaku] the other day, we cannot wait until we get the first slap [difficult moment against us], for example against Brighton the first 15/20 minutes we were a little shy if you like.
"But now we say let's go for the game as we did against Tottenham and if we go for the game even if you receive a goal against you then you are confident enough to believe in what you're doing. The other day I was playing and I was thinking this is the way we have to play every game in terms of attitude.
"Of course you will have days which are better or there might be one where you hit the post and then in another you might make an amazing pass and another day you might make a bad pass but in terms of attitude and commitment the basics are clear. We have to play that game back and watch what we did."