Despite guiding the club to fourth place in Serie A, Reja told fan website Cittaceleste.it: "My adventure at Lazio ends here.
"Even after my refusal, he (Lotito) invited me to reconsider and take a week to reflect. But I had already made my decision," Reja added.
Lazio, who had dissuaded Reja from quitting earlier in the season, made no immediate official comment.
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