Chelsea have completed the signing of Southampton midfielder Romeo Lavia.

Lavia has moved to Chelsea for a fee rising to £58m and has signed a seven-year contract.

Lavia said: "I'm really happy join Chelsea and be a part of this exciting project. It's an amazing football club with a great history and I'm really excited to get started.

"I can't wait to meet all my new team-mates and build a chemistry together to achieve great things together."

Co-sporting directors Laurence Stewart and Paul Winstanley said: "We are very pleased to welcome Romeo to Chelsea. He demonstrated his quality in the Premier League last season at Southampton, showing maturity despite his young age, and is a player we have monitored for some time.

"We believe he is ready to make an impact at Chelsea throughout the current campaign, and in the coming years."

Lavia will wear the No45 shirt at Chelsea.