The Andalusian outfit have endured a far-from-ideal start in La Liga, winning just two of their first eight games in La Liga.
Mendilibar hit rock bottom after the 2-2 draw against Rayo Vallecano over the weekend, with Sevilla sacking him with immediate effect.
He succeeded Jorge Sampaoli in March and was presented with the major task of steadying the ship at Sevilla.
The 62-year-old exceeded expectations by propelling Los Nervionenses to Europa League glory, producing incredible victories against Manchester United, Juventus and AS Roma en route.
However, that fairy tale run looks like a distant memory as Mendilibar has bitten the dust after just six months in charge.
It is the third dismissal in a year following Julen Lopetegui and Sampaoli in what is turning out to be a managerial merry-go-round at the Ramon Sanchez Pizjuan Stadium.
Sevilla’s poor financial state is a primary reason behind the recent decline, as the managers weren’t provided with enough resources to keep pace with the best clubs.
President Jose Castro and sporting director Victor Orta are now working on appointing a new manager, who will have the challenge of restoring some winning momentum.
The Andalusian outfit are 14th in La Liga and third in their Champions League group behind Lens and Arsenal, having registered two draws in two games.
Sevilla will face league leaders Real Madrid after the international break.
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