He won one of the bronze medals in the –63 kg event at the 2019 Summer Universiade held in Naples, Italy.

A year later, he won one of the bronze medals in the −58 kg event at the 2014 European Taekwondo Championships held in Baku, Azerbaijan.

Chellamootoo represented France at the 2015 European Games in Baku, Azerbaijan in the men's 58 kg event without winning a medal.

In 2019, Chellamootoo competed in the men's bantamweight event at the World Taekwondo Championships in Manchester, United Kingdom where he was eliminated in his first match by Korai Murakami of Japan.

[3] At the 2019 Military World Games held in Wuhan, China, he won the silver medal in the –63 kg event.