Macarthur is a talented and versatile winger, attacking midfielder or striker who was most recently at League Two side Gillingham.
During his time at Priestfield Stadium, Matty also spent time on loan with Tonbridge Angels, Margate and Sheppey United.
Back in Australia, he has also played for Western Sydney Wanderers.
The 20-year-old attacking player signed for Farnborough in November 2024, making his debut away to Boreham Wood at the start of the month.