The international break, coupled with Saturday’s trip to Blackburn, means the Blues’ last game was the 3-1 win against Preston North End on November 9.
The extended period without a game, will have given John Mousinho a chance to get some of his walking wounded back.
But what’s the current injury situation ahead of the PO4 showdown for both clubs?
Here’s the latest.
5. Zak Swanson - doubt
The right-back hasn't featured since the beginning of October because of a heel issue. The former Arsenal man was back training during the international break, though. Surely tonight's game should see him back and available for selection. Photo: Jason Brown
6. Jake Cooper - Out
The Millwall defender hs been ruled out for 10 weeks with a knee injury. He experienced campaigner missed Saturday's draw against Sunderland. Photo: Yui Mok
7. Billy Mitchell - Doubt
The midfielder is yet to feature this season because of a quad injury. He's back training, though, and closing in on a return. Photo: Alex Pantling
8. Josh Coburn Doubt
The on-loan Middlesbrough man picked up a knock during the second half of Saturday's 1-1 draw with Sunderland. Photo: Yui Mok