In 2010 his first season at Port Melbourne he was selected in the VFL team of the year Centre Half Forward.

Sinclair was drafted by the West Coast Eagles and made his AFL debut in round 2, 2013 against eventual premiers, Hawthorn Football Club.

He returned to senior football in 2014, playing the first 3 rounds as relief ruck, before being dropped to the WAFL.

He was selected ahead of Scott Lycett in the 2015 AFL Grand Final against Hawthorn, amassing 10 hit outs and 4 handballs, in a losing team going down by 46 points.

[6] Following the grand final, he was traded to the Sydney Swans in a straight swap deal for the out-of-contract premiership player, Lewis Jetta.