Lustica, who has made 85 A-League appearances for the Roar, will strengthen Western Sydney's midfield, which already includes Dimas and former teammate Mitch Nichols.
The 25 year-old started his A-League career with Gold Coast United, and then spent two seasons playing in Croatia, before returning to Australia where he played for Brisbane Roar, twice, and Adelaide United.
It was during his stints at Brisbane where the Australian Under-20 representative thrived by playing a key role in the Roar’s 2013-2014 premiership and championship double.
Lustica said it wasn’t a difficult decision to join the Wanderers after coach Tony Popovic came calling.
“It didn’t take a lot of convincing to see what’s happening at the Wanderers - with the set-up there, the club is growing every year and it’s something that I wanted to be a part of,” Lustica said.
“It’s a big honour for me to be part of this club: I’m looking forward to working under Popa and the rest of the staff. It’s really exciting times ahead.”