The Gulls’ 5-0 loss to Balcatta dropped them to fourth on the table ahead of a must-win clash against Inglewood.
ECU Joondalup’s 3-1 win over Cockburn City has it in seventh and four points off a top five spot as it heads into a clash with Perth.
The Gulls were 1-0 down at half-time but the flood gates opened in the second half as the home side piled on four goals.
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READ NOWSorrento coach Jamie Harnwell rued the effort of his side.
At Dalmantinac Park, a two-goal display from ECU Joondalup’s Danny Dixon had the away side 2-0 up against Cockburn City by the ninth minute of the match. The Cockerels snatched one back early in the second half but ECU quickly responded.