The Wanderers return to Bankwest Stadium on Tuesday night to take on Perth Glory in their third match of the season restart.
The Red & Black head into the match filled with confidence after keeping their Finals Series hopes alive in a 1-0 win over high-flyers Wellington Phoenix on Friday night.
Kwame Yeboah was the match winner for the Wanderers, heading in an inch-perfect cross 17 minutes from time to clinch a crucial result for the home side.
The decisive goal came just eight minutes after Phoenix were reduced to 10 men after Luke DeVere was sent off for receiving two yellow cards, the second of which was a foul on the Wanderers hero.
Perth, in their most recent match, faced a 5-3 thrashing by Adelaide United.
The Reds set up their win with a four-goal burst in the space of 18 minutes to extend their unbeaten run under interim manager Carl Veart to three games.
Glory added two goals late – through Bruno Fornaroli and Juande to add some respectability to the score but it was mere consolation.
The result saw Perth suffer back-to-back loses with no doubt that they will be looking to turn the tide come Tuesday night against the Wanderers.
The last time these two sides faced each other was back in late January in Round 15 at Bankwest Stadium.
The Red & Black could not have got off to a worse start with Perth taking the lead just six minutes into the game.
The home side lost possession 35 metres from their own goal with Bruno Fornaroli swooping and racing inside the box, before firing off a shot that took a deflection into the back of the net.
There were some moments of concern after that as the Red & Black tried to regroup before they eventually found their feet.
Muller then produced one of the best moments of the half when he latched on to a cross from the right from Daniel Georgievski.
The Wanderers came out strongly in the second half and really put some pressure on the Glory defence in the opening 20 minutes.
The Red & Black thought they had an equaliser on 53 minutes when Georgievski powered a ball across the face of the goal for Kwame Yeboah to chest the ball into the back of the net.
However, the VAR intervened and ruled the ball had hit his arm.
That seemed to stir the Red & Black into action with Bruce Kamau (twice), Muller and Patrick Ziegler firing off shots in the space of seven minutes but it wasn't enough to find the equaliser.
It is set to be another must-win fixture for the Wanderers who need to accumulate as many points as they can get to propell themselves into the Finals Series.
Western Sydney Wanderers v Perth Glory
Tuesday 4 August
Bankwest Stadium, 7:30pm