Aalborg coach Brian Rioch says facing Champions League rivals Manchester United tonight is the biggest game in their history.
There will be only 10,000 people in Energie-Nord Arena on Tuesday evening, but Rioch warned: "If we were to take a point off them then it will be like an earthquake in here.
"This is the biggest game in our history. To get to this stage of the Champions League is a fantastic achievement. But to play Manchester United is something else. This is a huge day for Danish football as a whole.