England international Raheem Sterling on Wednesday became Chelsea's
The 27-year-old has signed a five-year contract worth 50 million pounds ($59 million).
"England star Raheem Sterling has joined Chelsea from Manchester City on a five-year contract," the buying club said in a statement posted on its website.
Sterling anticipated his move earlier on Wednesday by posting a farewell message on social media saying he left City as a "man" who arrived from Liverpool aged 20.
However, once the signing with Sterling became official - who was with Chelsea on their pre-season tour of the United States - he turned his attention to what he hoped to achieve under Thomas Tuchel.
"Obviously I've achieved a lot in my career so far, but there's still a lot to do and I'm really looking forward to doing that in a Chelsea shirt under Thomas," said he said in a statement.
"London is my home and where it all started for me and it's great to now have the opportunity to play against friends and family for a week at Stamford Bridge.
Sterling, a 77-time champion, has won four of nine Premier League titles since joining City from Liverpool in 2015.
A key player at the start of Pep Guardiola's reign at City, Sterling scored 131 goals in 337 appearances for the English champions.
However, his regular place in City's starting line-up came under increasing threat with the £100m signing of Jack Grealish from the Premier League last year, as well as the emergence of Phil Foden from the club academy.