United go into the game on the back of a 4-3 defeat at Chelsea.
"We have to step up and make better decisions," said Ten Hag.
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"We can play to a very high standard. We can compete with the best and beat the best in the Premier League. When you can do that, you can also do it across Europe.
"We need to learn how to bring big games over the line.
"We have to recover very quick. We have to turn this around. We will be in a positive mood and we will be looking forward.
"We have to take energy but we will be mad, angry. From anger you can take a lot of energy and that is how we have to do it."