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Scans have since confirmed a rupture of Williams' hamstring tendon, an injury that usually takes at least three months to recover from. Williams, a veteran of 14 internationals who hadn't given up hope of forcing his way back into Graham Arnold's Socceroos plans for the 2022 World Cup, will have to undergo surgery to repair the tendon.
The news is the last thing the Wanderers needed as pressure continues to build on coach Carl Robinson.
The Red and Blacks have won just one of their six league matches this season and sit eighth on the ladder.
Western Sydney will sit out this weekend's action after their game with the Victory at Commbank Stadium was postponed after three positive COVID-19 cases within the Melbourne club's squad earlier in the week.