The Spanish coach, who recently extended his contract with Bayer Leverkusen, was approached by Marseille following the departure of Roberto De Zerbi. Despite Marseille's successful second-place finish in Ligue 1 last season, internal upheaval including the departure of sporting director Medhi Benatia has deterred Alonso from taking the position.
Marseille's managerial position remains open as the club continues its search. Among the names mentioned as potential replacements are Habib Beye, who recently managed Stade Rennais FC, and Sérgio Conceição, currently in charge of Al-Ittihad Club.