FC Lost 1-5 but still go thru

Nantwich Town might have beaten FC United 5-1 in the Unibond President's Cup on Monday but today they were disqualified for fielding an ineligible player. Don't know what to make of this. I'd rather FC United concentrate on winning a third successive promotion than having an extra game. So it's a semi-final away to Goole AFC on the 8th March.