[3] Whilst with the Bairns, Sinnamon made his Falkirk, and senior professional debut, in a Scottish Championship match against Dumbarton on 24 October 2015.
[5] In September 2016, Sinnamon joined Scottish League Two side Annan Athletic on loan until January 2017.
[6] On 11 January 2017 he was released by Rangers without making a single appearance for the Glasgow club, and was subsequently signed by Scottish League Two side Elgin City.
[9] After a year with Broomhill, Sinnamon signed for Pollok in the West of Scotland Football League in July 2022.
[11] Sinnamon was capped by the Scotland national under-19 football team making thirteen appearances, his final match coming in 2015.