There were some rumors earlier in the day by Italian media about Siena negotiating with Marouf.
A site which is led by Marouf said later on Wednesday that the Iranian captain has signed a contract with the Italian team.
Speaking with the Islamic Republic News Agency, a source close to Marouf also confirmed the news.
Marouf became the champion in Russia with VC Zenit-Kazan in 2015.
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