Born in Douala, Yondjo is a youth product of the Brasseries Academy in his hometown, where he proved to be a standout player and prolific goalscorer in youth tournament.[1][2]
In a youth setup that had recently produced the likes of Carlos Baleba or Aboubakar Nagida, but also past legends of the game like Samuel Eto'o, Yondjo reportedly attracted the attention of Ligue 1 big teams, as well as other renowned European academy like RB Salzburg's as soon as in the spring 2024.[2][3][4]
As he kept on impressing during the following summer,[5][6] his following in Europe even increased, as Chelsea and Manchester United joined the list of clubs named as potential destinations for the youngster.[7][8]
In July 2024, he was called with the Cameroon under-20 team, already proving to be the most decisive player in the friendlies that aimed to prepare the upcoming UNIFFAC continental qualifying, despite still only aged 17.[7][10] In this qualification tournament taking place in Brazzaville, he scored again, being most notably named man of the match in a 3-1 win against Gabon.[11] But his team being knocked out on penalty shout-out by RD Congo, after a 1-1 draw where Yondjo was his team only scorer, therefore not qualifying for the 2025 Africa Cup of Nations.[12][13]