I've been looking through the rules and can't find anything to specifically say what would happen if it is postponed on Tuesday, only that the game will take place according to the decision of the council.
Interetingly, should the replayed game be abandoned during extra time or penalties, a coin is tossed. Whichever team wins the toss chooses where a replay of the replay is played!
I'm sure it happened in the cup last season and a team played their previous round game on the date for the next round..can't remember who though
It will be fun getting tickets if we do win Tues though....3 days to sell 6000 tickets !!