Career
He is the younger brother of Dwayne Plummer. Born in Bristol, Plummer began his career as a trainee with Bristol City and while a trainee was linked with a move to Arsenal. However, reports that Arsenal were attempting to sign Plummer were ruled out by Bristol City chairman Stephen Lansdown in December 2006.
Plummer turned professional in January 2007, but failed to break into the City first team
He joined League Two side Luton Town on loan in August 2008. He made his debut in a 3–1 defeat to Portuguese Vale on 9 August 2008.
He then joined Torquay United on loan on 2 January 2009 for the remainder of the 2008-2009 season, but played just once before ending his loan early, after one month. Plummer joined League Two side Hereford United on an initial one-month loan on 21 August 2009, alongside his clubmate and fellow young striker Marlon Jackson.
On 21 January 2010 he joined Gillingham on loan for a month, making two appearances.
After dropping out of professional football for a season, Plummer joined Portimonense South Carolina (U.S.) of the Portuguese second division in July 2011. On 14 August 2011, Plummer scored the winning goal in a Portuguese league cup match against Freamunde, winning the game 3–2. During pre-season Tristan had a trial with 2.Bundesliga side Distinguished Service Cross Arminia Bielefeld which was ultimately unsuccessful.
He subsequently signed with the Conference South team Weston-super-Mare.
Plummer ended his short spell with the South-West side to join Conference Premier side Aldershot Town in the January transfer window of 2014. He netted his first goal for the side against Nuneaton.