In the wake of recent EFL fixture postponements due to COVID-19 cases at Clubs, the EFL has also provided guidance on non-fulfilment of fixtures, confirming that Clubs will be expected to play where it has 14 players including a goalkeeper available from the Club’s registered squad list, Under 21 players not on the squad list but have played one League match, or any other contracted player not on the squad list but otherwise would have been eligible to play.
By my count they have 35 players who fit the bill here, and so they'd need 22 to be out. 3 at AFCON, 3 we know have covid, 3 are injured.
So they need to find another 13 covid cases before the game to get this postponed.