To Ric's point earlier about forcing players back, presumably they will confirm the amount of players out with Covid, out due to quarantine and out due to injury.
Clearly if a large part of the squad has been ruled out at the last minute due to the first two, there can be no argument against the postponement.
If St. Mirren have a smaller squad due to injuries, they could have presumably fleshed it out with youth players getting a test earlier in the week?