For his role in Ted Lasso, Dunster was nominated for a Primetime Emmy Award for Outstanding Supporting Actor in a Comedy Series in 2023.

[4][5] He played rugby as a child, though he realised at the age of fifteen that he was too small after a failed trial for London Irish.

[7] In 2015, Dunster played Claudio in the Reading Theatre production of Much Ado About Nothing, made his television debut in the Channel 4 sitcom Catastrophe, and played Dickie Baker in the low budget film The Rise of the Krays, a role he would reprise in its sequel the following year The Fall of the Krays.

Dunster starred as Arthur in Pink Mist at the Bristol Old Vic and Bush Theatre in London,[8] for which he received an affiliate Laurence Olivier Award nomination in 2016.

That same year, he appeared in The Entertainer at the Garrick Theatre[9] and two episodes of the Sky One crime drama Stan Lee's Lucky Man.