Arsenal's hopes of catching Manchester City for second place in the Premier League suffered a setback.
The striker picked up a hamstring injury in Tuesday's Champions League quarter-final 2-1 defeat by Chelsea.
Arsenal captain Mikel Arteta will be out for the next three months after having a "successful" operation on the left ankle that has kept him sidelined since late November, the club said on Thursday.
Two Robin van Persie goals earned the Gunners a 2-1 victory as Chelsea slid to a second home league defeat of the season.
Chelsea went second in the Premier League with a comfortable 4-0 win at Burnley, on Sunday, which maintained their unbeaten start to the season.
Chelsea manager Jose Mourinho congratulated Arsene Wenger on his 18 years as Arsenal manager on Friday and said he had no need to apologise for calling him a 'specialist in failure' last season.
Former World Cup winner and Arsenal's record goal-scorer Thierry Henry announced his retirement from soccer on Tuesday, bringing an end to his a glittering 20-year career.
The four-times European champions went through 3-2 on aggregate after losing 0-1 in the second leg Champions League quarter-final.
Chelsea's recent record against Arsenal is awful. The Gunners chalked up two league wins and another in the FA Cup this season. \n\n
The top three places in the Premier League table look secure for Liverpool, Manchester City and Leicester City, but the fourth spot, currently occupied by Chelsea, remains tantalisingly within reach for several clubs including Carlo Ancelotti's Everton and Ole Gunnar Solskjaer's United.
UEFA has postponed all Champions League and Europa League matches due to take place next week because of the coronavirus outbreak, European soccer's governing body said in a statement on Friday.
Arsenal manager Arsene Wenger has criticised Barcelona midfielder Xavi for claiming Cesc Fabregas is "suffering" at the Premier League club.
Holders Manchester City cruised into the Champions League quarter-finals for the seventh consecutive season with a 3-1 victory over FC Copenhagen.
Arsenal recruited Lille's 24-year-old Ivory Coast forward Gervinho Monday as they bid to boost their firepower this season and end a trophy drought stretching back to 2005.
Atletico Madrid sealed top spot in Champions League Group D after second half goals from Frenchmen Kevin Gameiro and Antoine Griezmann but Napoli were held to a 0-0 Champions League draw at home by Dynamo Kiev.
The unstoppable Gareth Bale scored twice in Tottenham Hotspur's 2-1 victory over Newcastle United in the Premier League on Saturday while rivals Chelsea and Arsenal also won to add spice to the race for the Champions League spots.
Thierry Henry, Arsenal's all-time leading scorer, will return to New York Red Bulls next week as his loan spell cannot be extended past the agreed date, Arsenal manager Arsene Wenger said.
Antonio Valencia's early thunderbolt put Manchester United en route to a 4-0 Premier League victory over Everton on Sunday, but they needed a flurry of late goals to finally subdue their unfortunate visitors.
IMAGES from the English Premier League matches played on Saturday
Imperious Liverpool extended their Premier League home winning streak against Arsenal to six on Saturday with an easy 4-0 victory that lifted them to second in the table.
However, Arsenal will be without Gilberto and Ashley Cole for the Champions League match against Celta Vigo.
Mesut Ozil guided Arsenal to a 2-0 victory over Napoli while a late Cesc Fabregas header gave Barcelona a laboured 1-0 win at 10-man Celtic in the Champions League on Tuesday.
Samir Nasri's move from Arsenal to Manchester City moved a step closer on Tuesday when Arsenal confirmed they had agreed terms with their Premier League rivals for the French midfielder.
While Spurs play Inter Milan at home in Champions League on Wednesday, on Thursday, Arsenal face a long trip to Ukraine to play Vorskla Poltava in the Europa League, needing a victory to consolidate first place in the group.
Premier League leaders Chelsea beat London rivals Arsenal 2-1 with goals from Spaniards Fernando Torres and Juan Mata on Saturday to maintain their unbeaten start to the season while handing Arsenal their first defeat.
Arsenal forward Theo Walcott and Spanish midfielder Santi Cazorla have signed new contracts with the Gunners, the Premier League club said on Friday.
Arsenal boss Arsene Wenger has repeated his intention to stay in management next season, saying retirement would be like dying.
Arsenal brushed aside Reading 2-0 at the Emirates on Saturday for only their second win in nine EPL games.
The 28-year-old France mid-fielder said he is staying with the Premier League champions after having considered a move to Real Madrid.
Midfielder Jack Wilshere will be offered a new Arsenal contract despite being sent to Bournemouth on loan this season, the London club's manager Arsene Wenger said on Friday.
Arsenal manager Arsene Wenger is to stand down at the end of the season after a reign of almost 22 years that made him the most successful boss in the Premier League club's history.
For Arsenal, failure to defeat Wigan Athletic on Tuesday would leave their hopes of a 16th season in the Champions League in severe jeopardy; for Wigan Athletic, anything other than a win would quickly sour the taste of a memorable FA Cup final shock.
Arsenal's substitutes' bench was a man short against Bayern Munich on Tuesday after the Premier League side got caught up in red tape.