It simply does not get bigger than this. Derby County host Sheffield Wednesday at Pride Park on Saturday, May 7, with at least one of the two sides guaranteed to be playing football in Sky Bet League One next season.
The Rams come into the game on the back of a sixth successive defeat, away to confirmed play-off side Swansea City last Saturday.
Derby will stay up if they draw with Sheffield Wednesday and Rotherham United fail to beat Cardiff City.
If Derby win, they will stay up regardless of Rotherham's result in Wales.
Sheffield Wednesday must win and hope Rotherham fail to win, in order to stay up.
Whilst Rotherham must win and hope Derby either draw or lose in order to stay in the division.
Outsiders Wycombe Wanderers need a miracle to stay up. They need to win by at least 13 goals and hope Derby lose to Sheffield Wednesday and Rotherham fail to win.
Both sides come into this crucial encounter with long injury lists.
Krystian Bielik, Curtis Davies, Andre Wisdom, Lee Gregory, Tenden Mengi and Jordon Ibe are all missing for the hosts through injury.
Wednesday meanwhile, have just as many injury problems. Massimo Luongo, Cameron Dawson, Moses Odubajo, Dominic Iorfa, Tom Lees and Izzy Brown all remain sidelined for the crunch match.
Derby County (4-3-3):
Marshall; Byrne, Clarke, Edmundson, Buchanan, Bird, Knight, Shinnie, Lawrence, Jozwiak, Kazim-Richards.
Sheffield Wednesday (3-4-2-1):
Westwood; Borner, Hutchinson, Urhoghide, Palmer, Pelupessy, Bannan, Reach, Windass, Harris, Paterson.
Ones to watch
Kamil Jozwiak - Derby County
The Polish international winger joined the club for a reported £5 million last summer, but it is safe to say he has not hit the heights fans would expect.
This season, the 23-year-old has only scored once and assisted twice in his 40 league appearances this season. However, he does have the ability to change a game as shown from his time at Lech Poznan. His fast feet could hold the key to victory against Wednesday and secure Championship survival for The Rams.
Barry Bannan - Sheffield Wednesday
The little Scottish magician has been at the club since his arrival back in 2015 from Crystal Palace. He has been at the club through the highs of the play-offs and now the lows of potential relegation.
Now 31, it is clear he is in his prime years with many man of the match performances throughout the season. He is often at the heart of most Wednesday attacks with his ability to thread the ball through the eye of a needle. If The Owls are to stay up on Saturday, Barry Bannan will be the key.
The two sides last met back on New Years Day, with The Owls winning the game by a goal to nil thanks to Callum Paterson's goal on the hour mark.
Derby are unbeaten in their last 12 meetings in all competitions with Sheffield Wednesday at Pride Park. A good omen?
Last time out...
How to watch
Due to the current national lockdown, no fans will be in attendance at Pride Park. This means the game is available on iFollow through Derby and Sheffield Wednesday's respective club websites, with passes being priced at £10.
The game is also available on Sky Sports Main Event, with the game kicking off at 12:30 BST.
One will go down, but who will it be?