The Swans could use the points if they manage another upset.
However, United are unlikely to allow a second embarrassment, and honestly David Moyes  cannot afford for it to happen again.
Two losses in a row to Spurs in the league and Swansea in the Cup have the club and fans up in arms and a win on Saturday is all that they will tolerate.
Wilfried Bony has been on fire since the turn of the year and he will be the biggest worry for the home side’s defense.
United XI: De Gea; Smalling, Vidic, Evans, Evra; Cleverly, Carrick; Valencia, Rooney, Januzaj; Welbeck.
Swansea XI: Tremmel; Rangel, Chico, Williams, Davies; Canas, Guzman; Hernandez, Shelvey, Routledge; Bony.