Mathis Thierry Lambourde Frontier (born 9 January 2006) is a French professional footballer who plays as a forward for Serie A club Hellas Verona.

Born in Les Lilas, of Guadeloupean and Malagasy descent, Lambourde began his career at the age of seven with grassroots side Cosmos Saint-Denis.

[2] After only a season with Paris Saint-Germain, he moved to Jeanne d'Arc de Drancy in 2018, but the club would report that he had signed a six-year deal with Stade Rennais only a year later, in April 2019.

On 4 July 2024, Lambourde was placed under judicial supervisionand prosecuted for involuntary manslaughter, lack of insurance and "manifestly deliberate violation of an obligation of safety or prudence".

[8] The trial was held at the Rennes Criminal Court on 23 August 2024, in which Lambourde was handed a two-year suspended prison sentence for involuntary manslaughter.