Manchester United boss Erik ten Hag branded their start against Leeds as "unacceptable".
United came from 2-0 down to draw 2-2 with Leeds on Wdnesday night.
Ten Hag said, "You can say we won a point because when you are in a derby and come back from 2-0 down it is good. But on the other hand when you start a derby like we did it's unacceptable. You have to be ready to fight and we weren't ready for the battle.
"It was my first remark at half-time, to take care and make sure we were ready and we weren't so that was really disappointing straight after half-time to concede that goal.
"Of course it will encourage us for when we play the second game in a couple of days that if we play our game, we can beat them. We have to beat them. But you need composure all the time. In the last 20 minutes when it was 2-2 we created so many chances but the finishing was not always that good. We have to be more clinical.
"We knew before how they would play with attitude and style. We didn't know what system they would play but you have to be ready and read the game. You have to anticipate it. Definitely you have to win your battles. That is for everyone to take the responsibility. If you win those individual battles, you will win this game."