He has strong family connections in Australian football, whereby he is a fourth-generation VFL/AFL player, with his great-grandfather, grandfather, great uncle and father all playing in the VFL/AFL.

[2] At the end of 2015, Spargo earned selection in the AFL Academy due to his performances in the under-16 championships playing with the NSW/ACT Rams, where he won the Alan McLean Medal as the best player in division two.

[5][6] In April, he played two games with the UWS Giants in the North East Australian Football League, averaging 17 disposals as part of the GWS Academy.

[11] At the end of the season, he played in the under-17s All-Stars match and was named in Team Judd's best players by AFL Media after recording 16 disposals and a goal.

[19] He was listed with the Murray Bushrangers in the TAC Cup for the season but did not play a game due to GWS Academy commitments and injury.

[28] In June 2020, Spargo was suspended for two matches for breaching AFL COVID-19 protocols after he and teammate Kysaiah Pickett travelled via an Uber to an unauthorised house for a gathering.

[33] Callum Twomey echoed this description by noting Spargo is a consistent ball winner who tackles hard and also play in the forward line.

[34] Around the 2017 draft, his playing style was compared with Greater Western Sydney player's, Toby Greene's, by Fox Sports Australia's Ben Waterworth whereby both are "pocket rockets that [are] just as good in the air as [they are] on the ground"[35] He also drew comparisons to VFL/AFL games-record holder, Brent Harvey, by the Herald Sun's Jon Ralph, with both Spargo and Harvey being the same height, in addition to similar playmaking skills and poise.