I'm confused! Does anybody know what the current (Jan 2022) rules are for the number of substitutes allowed in a Championship league game? I've read so many changes and variations since this Covid thing started that I've lost sight of where things now stand.

I thought the latest was that up to 3 "normal" substitutes were allowed, plus up to 2 "concussion" substitues. But against Posh we sent on 4 substitutes. So who was declared to have been "concussed"? Posh clearly had a concussion injury in Edwards, but who was ours? Did Dike have a "concussed hamstring"?

So what have I missed - another change in the rules? Clarke, Phillips or Grant suffering a head injury? Or...?