Tense final on the cards
The teams have enjoyed a win each against one another in the league and Heritage believes this is an indication of how the game, to be played at Lancing, is likely to pan out.
He said: "It's going to be tough. I don't see any classic game. It's really going to be nip and tuck. It's possibly going to be decided by one goal."
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Hide AdUnited's cause has been dealt a blow by the news that semi-final shoot-out hero Matt Dadswell is unavailable. Owen Ball (hamstring) is a major doubt but Shae Spreafico (calf) hopes to be fit. Sidley are without a fixture on Saturday.