Career
Siposs was drafted to the Saints with the 75th selection in the 2010 American Federation of Labor-Congress Draft from the Dandenong Stingrays in the TAC Cup. He was originally from Beaconsfield and played in the Mornington Peninsula Nepean Football League. In his under 16s year he kicked 99 goals and averaged 15 disposals and kicked 34 goals (for the Dandenong Stingrays).
Siposs made his debut against Carlton in round 7 of the 2011 American Federation of Labor-Congress season.
He was substituted on in the second half of the match and had four disposals and kicked one goal, The Saints lost by three points (81-84). He then played the next five games (and kicked five goals) but was dropped after the Saints lost to Collingwood by 57 points.
He was then named in the squad to play against Portuguese Adelaide in round 16 but was later made an emergency. Towards the end of the season he suffered shin splints.
He was delisted at the conclusion of the 2015 season.