The fifth-placed Gulls� 5-0 loss to the league leaders leaves them four points and goal difference outside the final four, making a win against Balcatta at Percy Doyle Reserve this weekend all the more important if they want to stay in touch with the competition's best.
Sorrento was down 2-0 at half-time then conceded three goals in the second half with City's Danny Dixon and David Heagney taking a brace each from the Frank Drago Reserve match.
Sorrento coach Jamie Harnwell was disappointed with the effort.
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READ NOW"I’ve asked them to have a look at themselves and to make sure this doesn’t happen again this season," he told NPLWA.com.au.
At ECU Joondalup Football Stadium, the Jacks twice held the lead, but Armadale levelled on both occasions in a 2-2 draw.
Tommy Amphlett opened ECU's account with a lob at 22 minutes, but Danny Hodgson netted Armadale's first just under 10 minutes later.
It took only one minute for Armadale to draw level in the second half after the Jacks� Bayley Montgomery had put his side 2-1 ahead in the 72nd minute.
ECU coach Dale McCulloch rued the missed opportunity of victory. "I thought the game was there to be won. We went up twice but we couldn't defend it," he said.
Eighth-placed ECU faces third-placed Stirling Lions away on Saturday.