The Hammers added: "Diamanti faced stiff competition for a first-team place with the arrivals of Pablo Barrera, Thomas Hitzlsperger and Frederic Piquionne."
The club concluded its media release by revealing it "could unveil more exciting new faces before the transfer window shuts [on 31 August]".
West Ham, with no points from their first two Premier League games this season, have been linked with a move for Lorient striker Kevin Gameiro.
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