The Wanderers went into the match without Shinji Ono (illness), Ante Covic (groin) and Jerome Polenz (suspension), but had little trouble dispatching a lifeless Perth side playing to keep their season alive.
It took the visitors just 12 minutes to grab the lead through Mateo Poljak, who shuffled around Glory defender Michael Thwaite and blasted the ball into the bottom right corner of the net.
Haliti had two chances in the space of three minutes midway through the first half to double Western Sydney’s advantage, while Appiah beat Glory youngster Riley Woodcock for pace on multiple occasions.
Perth’s best chance of the first half came in the 29th minute when Chris Harold misjudged a header on the edge of the six-yard box.
Glory skipper Jacob Burns started on the bench for the second week in a row, but was brought on after the break and appearing to provide missing from Kenny Lowe’s side in the first half.
Former French international Gallas was left red-faced when he missed the ball as he attempted to clear it from the 20-yard box, only for Juric to swoop and score Western Sydney’s second for the evening.
Adding to Perth’s wounds, Thwaite picked up his fifth yellow card of the season and will miss next weekend’s away trip to Brisbane.
Perth Glory 0
Western Sydney Wanderers 2 (Poljak 12', Juric 71')
