SAINTS are set to visit Championship rivals Watford in the FA Cup fourth round later this month.
Fixtures are set to take place over the weekend of Saturday, January 27.
Depending on TV broadcast selections, fixtures can be scheduled from Friday to Monday.
Fourth round fixtures will be the last to include replays in the event of draws. Fifth round fixtures and onwards will go to extra time.
Saints swept past League Two Walsall 4-0 in their third round clash on Saturday, while Watford beat National League Chesterfield 2-1 thanks to a last-minute winner.
Watford, managed by Valarean Ismael, sit 10th in the Championship with 36 points after 26 games.
The two sides drew 1-1 at Vicarage Road in December in league action with Che Adams and Rhys Healey on the scoresheet.
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