The A-League's newest club announced on Saturday it had signed three players formerly of crosstown rivals Sydney FC in Michael Beauchamp, Mark Bridge and Shannon Cole.
The trio will be joined by defender Nikolai Topor-Stanley, who was recently released by Newcastle after three seasons with the Jets.
"I'm very pleased to have players with the experience of these guys in my squad," Wanderers coach Tony Popovic said.
"All four players have excellent pedigree in the A-League and each bring something different to the squad."
The players will commence training with Western Sydney on Monday.
The Wanderers will enter the competition in the 2012/13 season, opening their campaign against Central Coast on October 6.