As Sunderland-Mad revealed earlier this week, Reed is one of the club’s academy of products who has been told he can leave the Stadium of Light and the 21-year-old will join Pompey on an initial month-long loan, which could be extended until the end of the season.
Portsmouth suffered a shock defeat at home to bottom club Hartlepool United on Saturday.
Pompey caretaker boss Guy Whittingham: “Adam comes highly recommended by Kevin Ball, has played at this level before and will bring us plenty of energy.”
Sunderland Fixtures
Tuesday January 29 19:45 Sunderland v Swansea City
Saturday February 2 15:00 Reading v Sunderland
Saturday February 9 15:00 Sunderland v Arsenal
Saturday February 23 15:00 West Brom Sunderland
Saturday March 2 15:00 Sunderland v Fulham
Saturday March 9 15:00 QPR v Sunderland