Former Casula resident Charles M'Mombwa said it was a "big deal" to get the call from Macarthur FC coach Ante Milicic to trial.
M'Mombwa, former Marconi player Yianni Nicolaou and Walter Scott are the three latest signings for the Bulls ahead of their debut season in the A-League.
The 22-year-old attacking midfielder graduated from the Central Coast Mariners Academy in 2018 and made his A-League debut in 2019 against the Wellington Phoenix.
"I am very happy and humbled to be in the group to represent this region in our inaugural season," M'Mombwa said.
"I am looking forward to season and repaying the faith to Ante and the club for the opportunity."
Milicic said he has been impressed by the trio during their training at Fairfield Showground.
"Charles and Yianni have both shown their willingness to continually learn from some of the experienced players in our squad. They will all benefit greatly from being around the first team on a regular basis," Milicic said.
"I've worked with Walter previously with the Young Socceroos at the 2018 AFC under-19 Championship. It's great to give another local lad an opportunity and to represent the area."
Nicolaou, 20, returns home after time spent with English League 2 outfit, Salford City.
"It is extremely special to be part of building a brand-new club. It's been a great experience so far and I'm keen to learn from the senior players in the team," Nicolaou said.