1) Martial has to be on his game
In the Carabao Cup tie back in October, Marcus Rashford was effectively the difference between the two sides. With the 22-year-old out with a back injury, United will need their goal threat to come from elsewhere.
Anthony Martial has to step up to the plate. The Frenchman scored in the standout win against Manchester City in December but he was guilty of missing a clear cut chance versus Liverpool. He is frustratingly inconsistent and fans will be hoping he has one of his good days in front of goal on Monday.