Chelsea have signed Italy international Jorginho from Napoli after Manchester City pulled out of a £50m deal.
Jorginho, 26, has signed a five-year contract to join former Napoli boss Maurizio Sarri at Stamford Bridge.
On Thursday, City were assured by Jorginho's agent that the midfielder still wanted to join them, despite Napoli president Aurelio de Laurentiis saying the player favoured Chelsea.
"I am absolutely ecstatic to be here at Chelsea," Jorginho said.
"It is not easy to become part of such a big team so I am very, very happy. I am excited to play in such an intense league for a team that gives everything to play and win."
Brazil-born Jorginho had been at Napoli since 2014 and scored four goals in 36 appearances for the side last season as they finished second in Serie A.
He scored a penalty in Napoli's 4-2 Champions League defeat by Manchester City in November and also played for Italy in a 1-1 draw with England in March.
Chelsea director Marina Granovskaia described him as "one of the most coveted midfielders in Europe".
Jorginho - full name Jorge Luiz Frello Filho - was utilised primarily as a deep-lying midfielder by Sarri at Napoli and has been likened in style to former Spain international Xabi Alonso and ex-Italy midfielder Andrea Pirlo.
Having been born in the Brazilian state of Santa Catarina, Jorginho qualified for Italian citizenship through his grandparents and rose through the youth ranks at Hellas Verona before making his Serie B debut in September 2011.
He played a key role in helping Verona win promotion to Serie A in May 2013, which prompted Rafael Benitez to bring him to Napoli for £9m in January 2014, and won the Coppa Italia and Supercoppa Italiana in his first year in Naples.
Jorginho has won eight caps for Italy having made his international debut in a 1-1 friendly draw with Spain in March 2016.