A victory at The New Den will take Forest above the Foxes (who are currently 7th) and they will also be looking for 6th-placed Bolton to come unstuck at champions Cardiff.
Millwall still need points to secure safety and are looking to do the double over Forest after a 4-1 win at the City Ground in November.
Both sides are struggling for goals, the Lions having scored only 24 at home in the league and the Reds without a strike from open play in their last five matches.
Over 2,000 travelling supporters will be cheering on the visitors in South London.