The England midfielder will don the number 16 shirt, previously worn by former captain Roy Keane.
This and more from the happenings in the world of footbal.
Chelsea assistant manager Steve Clarke said the English Premier League leaders do not need another central defender.
Manchester United climbed back up to second in the table after second-half goals by Anthony Martial and Jesse Lingard earned a 2-0 victory at Everton -- their first win in five games in all competitions.
News of all that's transpired on and off the football field
Liverpool's Daniel Sturridge is set for a January return, according to manager Brendan Rodgers, who hinted he was unlikely to dip into the transfer market to solve the club's current striker issues.
The 27-year-old Wales captain signed a five-year deal.
Arsene Wenger will have more money to spend on players this summer after the club signed a new kit supply deal with German company Puma that begins on July 1.
The German midfielder said he chose to sign for Chelsea instead of Manchester United because the English champions are a better team.
News of all that's transpired on and off the football field
Tottenham Hotspur just beat the transfer window deadline to sign midfielder Danny Murphy from Charlton Athletic.
West Bromwich Albion have ruled out the prospect of Saido Berahino leaving the club during the current transfer window, leading Tottenham Hotspur manager Mauricio Pochettino to compare his club's pursuit of the striker to a frustrated love affair.
The England players are all set to be allowed to take part in the remainder of the cash-rich Indian Premier League after the postponement of their limited overs series in Bangladesh in September.
French teenager Anthony Martial, having scored as a substitute on his Premier League debut in Manchester United's last game, added two more goals to earn his team a 3-2 win at Southampton on Sunday.
Factbox on midfielder Roy Keane, who announced his retirement from international soccer on Friday.
The two previous meetings at Anfield ended in 4-0 and 3-1 defeats for Arsene Wenger's Arsenal teams, but there is a fresh optimism around the club after a successful transfer window.
West Ham United manager Alan Pardew said Argentina's World Cup pair would take his team to a new level.
Liverpool striker Luis Suarez wants an "amicable agreement" to leave the club, honouring last year's contract clause that said he could leave if they failed to qualify for the Champions League.
Manchester United have signed Dutch international goalkeeper Edwin van der Sar from Premier League rivals Fulham.
Paul Pogba repaid some of his world record transfer fee with two goals as Manchester United rediscovered their early-season shine, cruising to a 4-1 Europa League win over Fenerbahce to go top of their group on Thursday. Pogba scored a penalty and rifled United's third into the top corner. Anthony Martial also netted from the spot and Jesse Lingard fired home in the second half before former Old Trafford favourite Robin van Persie pulled one back for Fenerbahce. Inter Milan and AS Roma, though, had more testing evenings. Coach Frank de Boer breathed a sigh of relief when Inter survived an onslaught from Southampton to end a three-match losing streak with a 1-0 victory while Roma conceded twice late on to draw 3-3 at home to Austria Vienna.
Australia has a mandatory 14-day quarantine for international arrivals to curb the spread of COVID-19.
Chelsea are poised to sign striker Hernan Crespo and take their spending to close on 100 million pounds.
Manager Gerard Houllier will hope his policy of continuity pays off after an unfulfilling 2002-03 season.
West Bromwich Albion have signed Scotland midfielder Darren Fletcher on a free transfer from Manchester United, the English Premier League clubs said on Monday.
Arsenal have a strong enough squad to challenge for a first Premier League title since 2004.
Following is a match by match look at the English Premier League's season-opening weekend fixtures:
Jose Mourinho will forget what has gone on for the last three disappointing seasons at Manchester United, he said in his first interview after being installed as manager on Friday.
Tottenham Hotspur manager Andre Villas-Boas said the club could fine forward Gareth Bale for failing to attend training ahead of an expected world record "dream" move to Real Madrid. Bale, who has not been training with the squad due to injury, was granted three days off but did not report back to the club on Tuesday despite being pictured in London.
Former midfielder Paul Scholes, who played more than 700 matches for United, said the club are lagging behind City and a strengthened Liverpool this season.
The actor has been asked to be present before the adjudicating authority of the case here on August 23, they said.
Chelsea's struggle to retain the title is hardly surprising as the club returned to the Champions League and their league rivals strengthened their squads, former Leicester City manager Claudio Ranieri has said.
The England striker is looking forward to a "nerve-racking" new challenge after leaving his comfortable life at Liverpool.
Midfielder Keane, 34, joined United in 1993 from Nottingham Forest for a then British record fee of 3.75 million pounds ($6.43 million) and has been the lynchpin of Britain's most famous club for a decade.
News of all that's transpired on and off the football field
The 23-year-old Portugal midfielder is Chelsea's fourth recruit under new manager Jose Mourinho.
England striker Wayne Rooney has signed a four-year contract extension with Premier League champions Manchester United that will keep their prize asset at the club until June 2019.
The Ivory Coast striker is set to become the third most expensive player bought by an English club.
"I have gone with the decision that is in my heart and that is to stay with Liverpool," the England midfielder said.
