Worthing will be away to Cray Wanderers in the Ryman division one south play-off semi-final on Tuesday.
The Rebels finished their league campaign with a 3-0 win at Corinthian-Casuals on Saturday with goals from Ross Treleaven (two) and Andy Alexander.
However, the three other teams in the play-off positions also won which means Worthing finish fifth and go to second-placed Cray for the one-legged semi-final on Tuesday (7.45).
Cray beat Eastbourne Town 3-0 on Saturday to confirm second spot.
Burgess Hill won 2-0 at Chipstead while relegated Crowborough lost 2-0 at Whyteleafe.
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