Exeter City's third-round FA Cup tie with Liverpool could be worth as much as £1m to the League Two side.
The club expect that Friday's 2-2 draw, which was televised and attracted a crowd of almost 8,300 to St James Park, generated an income of around £250,000.
It is estimated that City, owned by the club's supporters, could make £700,000 from the replay at Anfield.
"We don't know the figures at the moment, but they will be substantial," chairman Julian Tagg told BBC Devon.
"I would have thought we'd have made £250,000 or hopefully more. The point is that we've worked as hard as we can to sell as much as we can to make the evening what it was."