Team Wellington made the ASB Premiership grand final in March but went down 1-0 to Auckland City, with Musa having a chance to level the match in the dying moments but his shot at goal was deflected wide.
His signing with South Melbourne was made public days later, the 22-year-old joining the club in the semi-professional state league.
A month after signing with South Melbourne, the Wanganui export graduated to full national honours after being called into the All Whites squad to face South Africa at Mt Smart.
South Melbourne were willing to release Musa for national duty after a series of withdrawals from the All Whites squad.
Following All White duties Musa returned to South, considered one of the most successful clubs in Australia. Established in 1959, they won four national NSL championships (the forerunner of the A-League), a host of Victorian titles and represented Oceania at the 2000 Fifa Club World Championship.
Musa scored once for South during the season (not normally a role for defenders) and won several Man of the Match awards in 2014.
South Melbourne now play an elimination final against Tasmanian champions South Hobart at the South Hobart ground on Saturday.
The winner of that match will progress to the semifinals to play the winner of Bayswater City (NPL Western Australia) and MetroStars Soccer Club (NPL South Australia).