The Reds will take just over 2,000 fans to South London for another vital game in their quest for a play-off place.
With Leicester City selling out of their allocation for the final weekend of the season at the City Ground it adds to up to two huge games for Forest and their supporters.
Millwall remain in danger of relegation to League One after a midweek defeat at the hands of Blackburn Rovers left them four points above the drop zone although they do have a game in hand on those teams around them.
Defender Danny Shittu will miss the clash with Forest after being sent-off for protesting against the award of a penalty to Blackburn towards the end of the game.
"That decision has cost us," said boss Kenny Jackett.
"I've just seen it again and it looked like a soft decision, in my opinion the referee got it wrong, it didn't look like there was any contact."