The French footballer is currently under contract with FC Sion. Guillaume played for BSC Young Boys from 2014 to 2020, where he played a central role in the club's success in the Swiss championship and Champions League. He was top scorer in the 2018/19 season. Before joining Switzerland, he played for PSG and Girondins Bordeaux, among others. In his career, he also made five appearances for the French national team. Guillaume about kingnature: "I like kingnature products because they are natural, honest and sustainable.