An away qualifying final win for the Gulls will earn them a major semi-final berth against league-leaders Stirling and a shot at a grand final spot.
A loss will have them take on the winner of this weekend’s elimination final between Cockburn City and Floreat Athena.
They head into Sunday’s clash with confidence, coming off a 1-0 victory against Bayswater in the final round last weekend.
Despite finishing below the side, Sorrento has not lost to it in two games this season, with a 4-1 triumph in round 11 their best effort.
The deadlock in last Saturday’s hard-fought match was broken at 65 minutes by seasoned Sorrento campaigner David Price.
Gulls keeper Curtis Aspden made a number of crucial saves to keep a clean sheet.
‘It was a massive graft for us today, they had a lot of possession, but we set our stall out and defended well,’ he told Football West news.
Cross-district side ECU Joondalup finished the season strongly with a 3-3 away draw against Inglewood United.
The Jacks looked in trouble at the foot of the table in round 18, but went unbeaten in their last seven games to finish three-places higher in eighth spot.