Will either side climb the table with a victory in South London?
Hosts Millwall come in to this one following three straight defeats, most recently beaten 2-0 at Burnley on Tuesday night.
In fact, the Lions are now winless in four, looking to avoid suffering four successive league defeats for the first time since March 2019.
SO, Will Gary Rowett’s team claim a much needed victory?
Cardiff City though are only one point above their hosts after they too were beaten on Tuesday.
Luton Town leaving South Wales 2-1 winners, with Romaine Sawyers’ late goal a mere consolation.
So, just like their opponents, Steve Morrison’s team are winless in four, dating back to 13 August.
Who will claim three vital points at The Den?