Playing for the
Black Leopards and being relegated from the
2020-21 South African Premier Division, Mthethwa was signed by first-tier team
Stellenbosch in the winter of 2022. Following a good start of the
2022-23 South African Premier Division campaign, he was suggested for a callup to
Bafana Bafana. Only three Stellenbosch players had been called up before, these being
Athenkosi Mcaba,
Antonio van Wyk and
Jayden Adams. The callup came for two friendly matches in September 2022. He featured in one of the games, against
Botswana. Mthethwa was subsequently called up to the
2023 COSAFA Cup as well. Nearing the end of the season, several clubs were linked with buying Mthethwa, including
Kaizer Chiefs and
AmaZulu. Stellenbosch manager
Steve Barker was reluctant to sell to a South African club, but was "not going to stand in the way when a European team comes in for one of our players, and he's got an opportunity to play at a higher level". ==Personal life==