On a day of frenetic spending that took the Premier League total to a record far above one billion pounds ($1.29 billion), Antonio Conte's side also missed out on two of their other targets - Alex Oxlade-Chamberlain and Fernando Llorente.
Images from the English Premier League matches played on Saturday
Defeats at Manchester City and Brighton & Hove Albion had left Arsenal down in 11th place but their victory on the south coast lifted them to ninth with 43 points from 31 games -- eight behind fourth-placed Chelsea who were playing City later.
Lacazette fired the Gunners ahead in the eighth minute after poor defending by the home side before new signing Gabriel made it 2-0 in the 49th and Aubameyang put the icing on the cake with a superb shot into the top corner.
Chelsea have two of the best three goalkeepers in the world, which will help make them serious contenders to win the Premier League this season, their manager Jose Mourinho told a news conference on Friday.
Chelsea's Guus Hiddink believed his side could qualify for next season's Champions League with a top-four finish but he has now virtually written off their chances.
Images from the English Premier League matches played on Saturday.
Manchester City took another step toward the Premier League title when they brushed aside Blackburn Rovers 3-0 for their 18th successive home league win to move five points clear of Manchester United at the top of the table on Saturday.
Arsenal fear Sanchez injury loss could be 'big blow'.
Tottenham Hotspur and Liverpool raised the spirits with a rip-roaring 2-2 draw in a pre-Christmas Premier League classic on Sunday after a weekend marred by COVID-19 related postponements.
Britain's sporting weekend was decimated by heavy snow and sub-zero temperatures with Sunday's Premier League showdown between Chelsea and Manchester United among the hundreds of fixtures to be called off.
Chelsea face the prospect of having veteran Didier Drogba as their only fit striker for their visit to Manchester United on Sunday in what is usually one of the standout matches of the Premier League season.
Chelsea have been accused of being boring but they will not mind one bit if they beat Crystal Palace at Stamford Bridge on Sunday to win the Premier League title for the first time in five years.
Anger driving City to new heights, says City manager Manuel Pellegrini.
IMAGES from soccer matches played in the EPL, La Liga and Serie A on Tuesday.
David de Gea's late own goal earned Sunderland a 2-1 win over Manchester United on Saturday and a vital three points in their bid for Premier League survival.
Chelsea is currently at the fourth place in the Premier League standings with 63 points from 37 matches.
ROund up of the EPL matches played at the weekend.
Antonio Conte spent the immediate aftermath of Chelsea's title-winning 1-0 victory at West Bromwich Albion on Friday being bounced skywards by his players but once back on terra firma his mind was already focusing on the next target -- the double.
Chelsea plucked a performance straight from the Jose Mourinho textbook -- with John Terry writing a chapter all of his own -- as they grafted to a 0-0 draw at Arsenal on Sunday that leaves them almost certain to claim the title.
Chelsea were given a stiff examination by Stoke City at Stamford Bridge on Saturday before extending their lead at the top of the Premier League.
Chelsea captain John Terry has been under the spotlight all week and there will be no change when the Premier League leaders play Arsenal on Saturday, the European champions' first big game of the season according to teammate Branislav Ivanovic.
English Premier League leaders Liverpool will need to maintain their excellent recent record against Everton in Sunday's Merseyside derby if they are to hold their advantage over second-placed Manchester City.
The win moved Juergen Klopp's side above Chelsea in the table and 11 points behind leaders Manchester City with a game in hand.
If you are a football fan, particularly of the English Premier League, you are bound to 'follow' your favourite club on Twitter.
Arsenal came up short as their hopes of a first league title since 2004 suffered a setback.
Defending champions Manchester City scintillated a stellar performance to record an emphatic 5-0 win over Newcastle, and reduced Chelsea's advantage to five points in the Premier League table on Saturday at Etihad Stadium.
Jubilant with his side's maiden Premier League title, LeicesterCity manager Claudio Ranieri has heaped praised on his players' determination and focus that led his side to the recent glory.
IMAGES from the English Premier League matches played on Sunday.
IMAGES from the EPL matches played on Wednesday.
Brighton & Hove Albion's match against Crystal Palace on Saturday will also remain postponed.
Media reports said former England manager Roy Hodgson was in line to replace De Boer at Selhurst Park.
Manchester United captain Wayne Rooney has apologised to his team mates after being sent off against West Ham United during Saturday's Premier League match following a rash challenge on Stewart Downing.
The defeat halted Brighton's impressive three-game winning streak which included a 4-1 win over Chelsea and a 3-1 victory at Arsenal in the League Cup on Wednesday.
Arsenal returned to the top of the Premier League on Sunday after Jack Wilshere rescued a point for them in a 1-1 draw at West Bromwich Albion, while rivals Tottenham Hotspur suffered a shock 3-0 thumping by West Ham United.
Table toppers Chelsea have seen their lead reduced to just six points thanks to a revival from reigning champions Manchester City. If Chelsea slip, City can pile on the pressure to make the EPL battle a little interesting.
Images from Sunday's English Premier League matches.
Photos from the English Premier League matches played on Wednesday
Tottenham Hotspur's tenacious chase of leaders Chelsea continued as they claimed a 12th consecutive Premier League home win with a 4-0 rout of Bournemouth on Saturday to cut the gap to four points.
Manchester City moved 17 points clear of the pack with a 3-0 win at Fulham on Saturday