Moriyasu steered Hiroshima to the Japanese league title in 2012, his first season in charge, before successfully defending it the following season and winning again in 2015.
The 48-year-old former Japan midfielder has overseen a disappointing campaign so far, with Sanfrecce slipping to 17th in the 18-team standings following a 4-3 loss to Urawa Red Diamonds at the weekend.
The defeat was the club's fourth in a row in the league.
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(Reporting by Michael Church, Editing by Editing by Peter Rutherford)
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