UEFA has announced the 25-man squads for the Europa League and Champions League, highlighting Manchester United's participation after their FA Cup win and Arsenal's surprise inclusion of Kieran Tierney. United's squad includes new signings like Matthijs de Ligt and Manuel Ugarte, while academy graduates Alejandro Garnacho and Kobbie Mainoo were excluded from the A-list but are eligible for the B-list. Arsenal's squad for the Champions League sees Tierney, who has struggled with injuries and was on loan last season, included despite not playing since August 2023. His injury during Euro 2024 had raised questions about his future at the club, but his inclusion could bolster Arsenal's defensive options. The Champions League format has shifted to a league phase with eight matches, enhancing the competition's structure. Arsenal's squad also features their summer signings, including Riccardo Calafiori and Raheem Sterling.