United have been drawn at home against either Tottenham Hotspur or Reading
in the FA Cup fourth round.
The Reds beat Aston Villa 2-0 in the third round with goals from Cristiano Ronaldo and Wayne Rooney.
Spurs and Reading drew 2-2 at White Hart Lane on Saturday, setting up a replay at the Madesjski on Tuesday 15 January.
FA Cup Fourth Round Draw:
Arsenal v Stoke City/Newcastle
Coventry v Walsall/Millwall
Oldham v Huddersfield Town
Wigan v Chelsea
Luton/Liverpool v Swansea/Havant & Waterlooville
Southend v Barnsley
Southampton v Norwich/Bury
Man Utd v Tottenham/Reading
Portsmouth v Plymouth
Derby/Sheff Wed v Preston
Watford v Wolves
Peterborough v Charlton/West Brom
Sheff Utd v West Ham/Man City
Mansfield v Middlesbrough
Tranmere/Hereford v Cardiff