At least there seems to be some consistency here. From what he said, we need 15 players to be available.
Assume the following are registered and not injured:
GK. Arnold, Andeng-Ndi, Seaden (3)
Defenders: Demi, White, Coulson, Hobson, Ralph, Clifford, Howard (7)
Central Midfielders: Phillips, Atkinson, Brunt, Ferguson, Gard (5)
Wingers: Egbri, Walsh (2)
Forwards: Dalby, Murphy, Dennis, Rush (4)
That makes 21 (assuming they are all fit).
We think at least 4 have COVID, which makes 17.
If more than 4 have COVID then it's going to be tight - especially if White/Howard/Phillips are deemed not fit.
Of course, we may have a couple of new signings too which might change the maths.
I reckon this could go down to the wire, you know, one or two more COVID cases could tip it to postponement if we don't sign anyone.