Agathe began his career at French side Montpellier HSC before moving to Scotland to join Raith Rovers and then Hibernian.
His performances gained him a high-profile transfer to Celtic where he enjoyed the most successful spell of his career winning three championships and was part of the squad that reached the 2003 UEFA Cup Final.
Agathe was spotted in his homeland of La Réunion began by a scout from French Ligue 1 club Montpellier HSC in 1992.
Fielded by O'Neill wide on the right, Agathe turned in an outstanding performance in a 2–0 win for Celtic, with his pace and skill running the St Mirren defence ragged.
[14] Agathe hardly featured during the 2005–06 season under new manager Gordon Strachan and was linked with a loan move to Leeds United,[15] then he had a trial at Middlesbrough.
[20] Agathe made a total of six substitute appearances in his short time at Villa Park, but did not start a single game.
[21] In April 2020, Agathe was appointed manager of English Northern Football League Division Two team Durham City.
[22] At the time the season was annulled due to the coronavirus pandemic, the club were seven point adrift at the bottom of the division, and during the summer Agathe would orchestrate a squad overhaul, including the arrival of players from Dutch footballing academies.
[25] Agathe, who played over 100 league games for Celtic, portrayed a Rangers striker in the Robert Duvall movie, A Shot at Glory.