The club Midtjylland might not be very well know within Europe, but in Denmark everyone knows who they are.
The Danish started up in 1999 and were quickly promoted to the top flight in 2000. The club has remained in the top division for the past 16 seasons. What's more, in May 2015, Midtjylland became Danish champions for the first time.
So do Manchester United need to be worried?
'Sky Bet' think it's going to be a definite win for Manchester United. But, that doesn't mean it could still be a difficult match for United...