The 28-year-old tied up the 15 million pound move late on Wednesday after passing a medical.
The Stamford Bridge clash (2130 IST) is one half of a heavyweight Sunday double bill as Manchester United also visit Manchester City (1900 IST).
Jota's header earned the three points but it was a struggle in the rain for Juergen Klopp's side who looked uneasy at the back without the injured Virgil van Dijk.
News of all that's transpired on and off the football field
Rui Patricio saved three penalties as Wolverhampton Wanderers defeated English Premier League champions Manchester City to claim the Premier League Asia Trophy 3-2 in a penalty shootout.
West Ham United stole the limelight with a stunning double swoop for Argentines Carlos Tevez and Javier Mascherano.
Images from the English Premier League matches played on Saturday.
Tottenham Hotspur maintained their perfect start to the season when they came from behind to win 2-1 at West Ham United and stay top of the Premier League on Sunday. Spurs lead the table with nine points from three games, followed by five clubs on six points, including Chelsea who play at Fulham later.
An English FA arbitration panel has ruled in favour of Sheffield United's claim for compensation against West Ham United in the Carlos Tevez affair, the Championship (second division) club confirmed on Tuesday.
Tottenham Hotspur are favourites to win the Premier League this season according to table-topping Leicester City manager Claudio Ranieri, because their title charge has virtually gone under the radar.
Manchester City have completed the signing of Argentine striker Carlos Tevez after he passed a medical, the Premier League club said on Tuesday.
Pressure is something that Liverpool manager Brendan Rodgers says comes with the territory, but after a dismal run, the odds on him becoming the season's first managerial casualty are swiftly shortening.
Brighton and Hove Albion scored late to earn a 1-1 draw at Crystal Palace. Sheffield United and Fulham also drew 1-1 as both teams picked up their first points.
Manchester United consolidated their fourth place, on 22 points, after first-half goals from Chris Smalling and Wayne Rooney and a brilliant, morale-boosting strike from Robin van Persie after the break sealed a 3-0 victory over Hull City.
Two spectacular goals from England winger Shaun Wright-Phillips kept Chelsea firmly on Manchester United's heels after a 4-1 win over West Ham United at Upton Park on Wednesday.
Pat Lampard, mother of Chelsea midfielder Frank and wife of former West Ham United player Frank Senior died on Thursday, Chelsea said in a statement.
Arsenal struck two late goals to escape with a point in a pulsating 3-3 home draw with bottom club Southampton but their Premier League title hopes suffered another setback on a Friday night of frazzled nerves in north London.
News of all that's transpired on and off the football field
'It's very difficult to play football in these circumstances within 48 hours. It's amazing for the fans around the world, everybody has the Premier League, I'm more than happy to do that but it's very hard for the players'
Manchester United crushed Derby County 4-1 away while Everton beat Aston Villa 3-1 at Goodison Park on Sunday to reach the quarter-finals of the FA Cup. United were pushed all the way by the Championship (second division) strugglers in the League Cup semi-finals last month but cruised home this time with goals by Nani, Darron Gibson, Cristiano Ronaldo and Danny Welbeck.
Argentina midfielder Javier Mascherano signed a four-year contract with Liverpool on Friday.
Rafa Benitez's risky decision to start Fernando Torres and Dirk Kuyt on the bench looked like a masterstroke on Saturday after the strikers came on late to earn a 3-2 victory at Portsmouth which sent Liverpool top. Liverpool's grandstand finish moved them one point clear of Premier League champions Manchester United, at least until Sunday when Alex Ferguson's side visit West Ham United for one of their two games in hand.
Craig Bellamy scored his second goal since joining Manchester City to earn his side a 1-0 victory over Middlesbrough in the Premier League on Saturday.
Mesut Ozil helped Arsenal shake off the hangover of a midweek pounding in Germany with a starring role in a 3-0 win at Aston Villa while sloppy Liverpool lost 3-1 at West Ham United in the Premier League on Saturday.
FA details Mourinho's expletive-laden rant at West Ham
Everton moved into fourth place in the Premier League on Sunday with a scrappy 2-1 victory at lowly Wigan Athletic.
West Bromwich Albion forward Nicolas Anelka has denied an English FA charge regarding an alleged anti-Semitic gesture he made during last month's 3-3 Premier League draw at West Ham United, his club said on Thursday.
Aston Villa took full advantage of the absence of the other Premier League high-fliers on Saturday, winning 1-0 at West Ham United to climb to third. A deflected James Milner shot 12 minutes from time gave Villa 34 points from 18 games and pushed them above Manchester United (32).
Premier League leaders Liverpool stumbled again at home on Saturday, needing two Steven Gerrard goals to salvage a point in a 2-2 draw with Hull City.
Tottenham Hotspur scored a 2-0 victory at Manchester City, whilst Arsenal posted a 3-2 victory at Blackburn Rovers.
Unbeaten Arsenal stretched their lead in the Premier league to five points after a 2-1 win at Aston Villa on Saturday while Chelsea beat West Ham United 1-0 to overhaul Manchester United and go second.
Manchester City maintained their perfect start to the season with a 2-0 victory over promoted Watford as champions Chelsea suffered a shock 2-1 home defeat by Crystal Palace on Saturday.
Holders Chelsea will meet Liverpool at Stamford Bridge in the quarter-finals of the League Cup next month.
Last season's beaten finalists Arsenal travel to Blackburn Rovers, while Manchester City play Tottenham Hotspur and West Ham United host Everton in the other games.
Chelsea's long unbeaten home record in the Premier League ended on Sunday when Liverpool earned a 1-0 victory to take over at the top of the standings. Xabi Alonso's deflected first-half shot sealed the points for the visitors, who move three points clear of Chelsea with 23 points from nine games. It was Chelsea's first home reverse in the league since February 2004, a run of 86 unbeaten matches.
Hull City gatecrashed the Premier League's top four again on Sunday with a 1-0 home defeat of West Ham United.
Arsenal turned on the style to beat Bolton Wanderers 3-1 on Saturday and get an early-season taste of the top of the Premier League. They top the standings on 12 points, one ahead of Liverpool, who were held to a goalless Anfield draw by Stoke City.
Liverpool snatched three points with a wild 1-0 victory over relegation-threatened Nottingham Forest.
David Beckham treated the fans to what they came to see, flashing his trademark smile and curling free kicks to lead the Major League Soccer all-stars to a 3-2 win over West Ham United on Thursday. Beckham and his team mates had insisted the game against the Premier League side was much more than a friendly for MLS as it continues its bid to be recognised as a quality league.