Frenchman Guintoli, 41, last raced in MotoGP in 2019 as a wildcard and test rider for Suzuki, but has stayed active in motorcycle racing with the Hamamatsu brand's endurance racing programme.
Alongside Yoshimura SERT team-mates Gregg Black and Xavier Simeon, he won the Le Mans 24 Hours motorcycle race in 2021 and scored a second triumph at the Circuit de la Sarthe the following year.
