West Ham have signed Italy centre-back Angelo Ogbonna from Juventus for a reported £10m.
The 27 year old has signed a four-year contract with the Hammers.
"My heart told me that the right decision was to play for West Ham United," he said.
Ogbonna, who joined Juve from city rivals Torino in 2013, made 31 appearances for the club last season and was an unused substitute in the Champions League final.
He becomes West Ham's fifth signing of the summer.
Pedro Obiang, Dmitri Payet, Darren Randolph and Stephen Hendrie are the other players to have joined new manager Slaven Bilic's squad.
Ogbonna has won 10 caps for Italy and was a member of the Euro 2012 squad, although he did not play.
Find all the latest football transfers on our dedicated page.