Answer
Jérémy Mathieu has worked under Pep Guardiola, a Spanish professional football manager and former player. Mathieu played under Guardiola at Barcelona from 2014 to 2017, winning the La Liga title, the Copa del Rey, the UEFA Champions League, and the FIFA Club World Cup. Guardiola is considered one of the greatest managers of all time, and Mathieu was one of the many players who benefited from his coaching.