Inter boss Jose Mourinho, who guided the side to an unprecedented Italian treble, wants to coach Real Madrid and is poised to hold talks with the Serie A champions about leaving.
Serbian Mihajlovic, who departed as Inter assistant coach in 2008, made no reference to Inter in his resignation letter but fans will now be wondering about his motives.
"I hope to soon find a job which legitimises my decision and my professional ambitions," he said on Catania's website, apologising several times for the distress he has caused the club.
The former Inter hardman kept modest Catania comfortably in Serie A this term in his first season in charge and the Sicilians beat Mourinho's side along the way.
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