The 18-year-old has signed a lengthy contract with the A-League club this week.
“Securing such a promising young midfielder is a testament to our club's new vision of integrating youthful talent into our squad and first-team environment. Shae's addition promises an exciting era ahead for the Roar family."
“We didn't sign Shae because his father is Tim Cahill," manager Ross Aloisi added.
“We signed him because he's a good young footballer that can contribute to what we want to achieve now and in the future. He's also a good kid that will fit into our club's culture."