Cardiff have lost back-to-back games but are still in possession of the final playoff spot, three points better off than 10th-placed opponents Derby.
Since taking 10 points from the first 12 on offer after returning to action last month, Cardiff have since lost 3-2 at home to Blackburn Rovers and 2-0 away at Fulham.
However, the sides around them have failed to capitalise - Derby among them - and the Bluebirds' promotion fate is still in their own hands with three games to go.
This is the toughest of those three remaining fixtures, the other two being against lowly Middlesbrough and Hull City, although those two sides still have plenty to play for.
Three points on Tuesday would not only strengthen City's grip on the top six but also kill off Derby's own playoff hopes, with the Rams likely needing three wins from three.
Phillip Cocu's men won four games on the spin either side of the lockdown, before drawing with rivals Nottingham Forest and losing against Brentford and West Bromwich Albion.
It leaves them 10th in the division and three points off the top six ahead of games with Cardiff, Leeds United and Birmingham City.
This trip to Cardiff may seem fairly daunting on the face of it, but the Bluebirds have a pretty poor record at home under Neil Harris, winning just two of their last 11 there.
Derby won three away games on the spin prior to their loss against West Brom last time out, meanwhile, though their overall away record this term is among the worst in the league.
County have won just one of their last four encounters with Cardiff - a 3-1 home victory last season - with this term's reverse fixture finishing all square at Pride Park.
With seven teams separated by just four points in the race for sixth, a repeat of that scoreline on Tuesday would not suit either of these sides.
Cardiff City's Championship form: WWDWLL
Derby County's Championship form: WWWDLL
Calls for Lee Tomlin to start for the first time since February have only grown following his impressive cameos from the bench, and Harris has hinted that the midfielder is ready to play from the off.
As for Derby, Ben Hamer has come under increasing pressure after making another error in the 3-1 loss to Brentford on Saturday, though Cocu is expected to stick with his number one.
Cardiff City possible starting lineup:
Smithies; Sanderson, Morrison, Nelson, Bennett; Bacuna, Ralls; Mendez-Laing, Tomlin, Murphy; Glatzel
Derby County possible starting lineup:
Hamer; Bogle, Evans, Clarke, Lowe; Rooney, Bird; Knight, Sibley, Lawrence; Martin
We say: Cardiff City 1-1 Derby County
Both teams enter this match on the back of successive defeats and will be targeting all three points in South Wales. Only Millwall have drawn more games than Cardiff and Derby this term, and we can see the points being shared in midweek.