United will visit the South Coast on or before Saturday 17th December, with a place in the last 32 of the competition at stake.

Late goals from Matt Mayes and Tommy Scutt saw Pompey overcome the Met on home soil, the visitors having already seen off four different sides to reach the Second Round.

Quarter-finalists in 2014 and 2015, United were denied a place in the last 16 by AFC Wimbledon last term, losing 2-1 at St. James' Park.