Pedro Obiang has left West Ham for Serie A side Sassuolo in a deal reportedly worth €9 million (£8m/$10m).
Obiang, 27, joined the Hammers from Sampdoria in 2015 after showing potential in Italy, but he has been unable to hold down a first-team spot in the Premier League.
Although the Spain-born Equatorial Guinea international played 24 times in the league last term, only 12 of those outings were as a starter and he has opted for a return to Serie A.
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Obiang reportedly secured a four-year deal, though Sassuolo did not confirm the length of his contract or the fee paid to sign him.