Forest, who will have to beat Tottenham in their replay at The City ground next month to book their place in the final eight have been allocated ball number two in the draw which takes place on monday at 1.30pm.
Sixth Round Numbers:
1 Bolton Wanderers
2 Tottenham Hotspur or Nottingham Forest
3 Manchester United
4 Leicester City
5 Burnley or Blackburn Rovers
6 Southampton or Brentford
7 Newcastle United
8 Arsenal or Sheffield United
Quarter final games will be played on the weekend of 12/13 March.