Jorginho has completed his move to Chelsea after signing a five-year deal from Napoli
The transfer is understood to be worth around £57m.
Jorginho will wear the No 5 shirt this season under new Blues manager Maurizio Sarri.
The 26-year-old midfielder, who follows Sarri to Stamford Bridge from Naples, has signed a five-year deal having been heavily linked with a switch to Premier League champions Manchester City.
Jorginho, capped eight times, told the club’s official website: “I am absolutely ecstatic to be here at Chelsea. 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.”
Granovskaia added: “We are delighted Jorginho has chosen to join Chelsea. He was one of the most coveted midfielders in Europe and will become an important member of the playing squad.
“He has demonstrated his quality working under Maurizio Sarri and we are convinced his signing will help bring further success to Stamford Bridge.”