Youth Athiu joined
South Springvale SC in 2006 at 14 years of age, and became a member of the first team three years later. In 2012, Athiu signed a short term deal with rivals
Springvale White Eagles, with the success from the
Springvale based clubs later earning him a deal with the more prominent
Victorian State League side
Box Hill United in the same year. Following more success, in 2014 Athiu signed for
Heidelberg United in the
NPL Victoria.
Melbourne Victory After initially being linked with a move to
Perth Glory, Athiu signed his first professional contract with
Melbourne Victory in October 2017 on a season-long loan from
Heidelberg United. Victory coach
Kevin Muscat initially stated that it would be some time before Athiu would make the first team due to injury and fitness concerns. Nevertheless, Athiu made his debut for the club as a substitute in a draw with
Western Sydney Wanderers on 6 November after a number of Melbourne's attacking players were unavailable for the game. On 18 June 2018, Athiu signed a new two-year contract with Melbourne Victory. On 28 August 2020, Melbourne Victory announced that Athiu would not be receiving a new contract. ==International career==