United booked their place in the last 16 with a 1-0 win over Manchester City at St. James' Park on Wednesday night, with Alexander Isak netting a second half winner for Eddie Howe's side.
And their reward is a trip to face City's local rivals at Old Trafford in what will be a replay of last season's final at Wembley, which Erik ten Hag's men won 2-0.
Fourth round ties will be played during the week commencing Monday, 30th October. Further details will be confirmed in due course.