Paul Joly has been officially loaned to Kaiserslautern, a second division German team, with an option to buy. AJ Auxerre confirmed the transfer on August 26, 2025. The loan deal includes a purchase option, though the financial details of this option remain undisclosed. The 25-year-old right-back departs AJ Auxerre during the summer transfer window, following an agreement between both clubs for his move. AJ Auxerre conveyed their well-wishes for Joly, expressing hope that he has an excellent season in Germany. The French defender, who was also linked with Saint-Étienne, holds a contract with Auxerre until 2027 and has a market value of €1.80m according to Transfermarkt.