Barcelona will put Manchester City to the sword if they commit the same kind of errors as they did in their Champions League encounter last month, coach Luis Enrique said.
Arsenal's miserable week got worse on Saturday when they were knocked out of the FA Cup in a 2-0 fifth round defeat at Sunderland while beleaguered Chelsea fared only slightly better by scraping a 1-1 draw against second tier Birmingham City.
Arsenal and Manchester United will be out to make amends after a weekend of damaging results when they meet at The Emirates in the Premier League on Wednesday.
Out-battled for an hour by their modest south coast opponents, Arsenal belatedly sparked into life and Olivier Giroud's glancing header two minutes into stoppage time completed their remarkable recovery from 3-0 down.
A second-string Arsenal side proved strong enough to secure a 2-0 victory at Championship club Burnley on Sunday and with it a place in Monday's FA Cup fourth-round draw.
Former winners Borussia Dortmund host Arsenal in their Champions League Group F opener on Tuesday, with both sides desperate to drag themselves out of an early slump this season.
Arsenal re-established themselves as serious contenders for their first Premier League title since 2004 with a comfortable victory at lowly Bournemouth on Sunday.
Arsenal beat Manchester United 1-0 to keep the Premier League title race wide open on Sunday with Aaron Ramsey's second-half winner cheered almost as loudly by Chelsea's fans as Arsenal's.
North London Club Arsenal has agreed a 23 million fee to sign Real Madrid striker Gonzalo Higuain, smashing their previous transfer record.
Champions Chelsea beat 9-man Arsenal 2-0 in a heated match at Stamford Bridge last week but a coffee brand had to bear the brunt of angry Arsenal supporters.
Arsenal fought back from a goal down against old foes Chelsea to reach the League Cup final as Granit Xhaka poked home to complete a 2-1 second-leg win on Wednesday that set up a Wembley showdown with Manchester City.
Images from the English Premier League match between Arsenal and West Ham United on Tuesday.
Arsenal will man the barricades on Tuesday in anticipation of a Barcelona backlash while hoping that their second Champions League visit to the Nou Camp in less than a year will be less harrowing than the first.
Arsenal, Olympique Lyon and Villarreal try to venture into the unknown this week when the second legs of the Champions League quarter-finals take place.
Arsenal's improbable late run at the Premier League title gained momentum with a 1-0 victory at struggling Burnley on Saturday, an eighth straight triumph that moved them within four points of leaders Chelsea.
Arsenal have the players and qualities to challenge for the Premier League title and their failure to do so is frustrating, striker Alexis Sanchez has said.
The club has not made the length of the new deal public, but manager Arsene Wenger told Arsenal's website (www.arsenal.com): "It's fantastic news that Robin van Persie has committed his long-term future to Arsenal Football Club, we're all delighted.
Central defender Thomas Vermaelen is mulling the prospect of leaving Arsenal in January to boost his chances of playing for Belgium in the World Cup finals.
Arsenal midfielder Aaron Ramsey hopes the North London can choke LeicesterCity's unexpected Premier League title charge after picking up their first win in five matches in Sunday's 2-0 win over Bournemouth.
A Robin van Persie double earned Arsenal a fifth consecutive Premier League victory on Saturday as Arsene Wenger's side beat Norwich City 2-1 at Carrow Road.
Photos from the UEFA Champions League Round of 16, 2nd leg match played between FC Barcelona and Arsenal at the Camp Nou on Wednesday
Arsenal, who went nine years without a trophy before winning the FA Cup in May, collected their second piece of silverware in three months when they crushed champions Manchester City 3-0 in the Community Shield at Wembley on Sunday.
Blackburn Rovers heaped more misery on Arsenal when they came from behind to beat Arsene Wenger's side 4-3 in the Premier League on Saturday with the Gunners conceding two second half own goals at Ewood Park.
Uzbek billionaire Alisher Usmanov, who is a major shareholder in the Arsenal Football Club, is of the opinion that manager Arsene Wenger needs to be given the financial backing to bring in experienced players to end the club's six-year trophy drought.
West Ham United capitalised on two mistakes from Arsenal's new goalkeeper Petr Cech to claim a surprise 2-0 victory at the Emirates and bring the Gunners' early Premier League optimism down to earth with a bump on Sunday.
Tottenham Hotspur climbed to third with a 3-1 win over Southampton while Chelsea hung on to fourth spot, above Arsenal on goal difference, despite a 2-1 defeat at Wolverhampton Wanderers.
Arsenal striker Olivier Giroud has no concerns over his future at the club despite being displaced in the starting line-up by Alexis Sanchez, vowing to fight his way back into manager Arsene Wenger's first-team plans. Chilean forward Sanchez has shone in the central striker's role, scoring eight goals in 15 appearances this season, while Giroud has missed much of the campaign with a toe injury.
Images from the English Premier League matches played on Saturday.
Arsenal have signed Morocco's 26-year-old striker Marouane Chamakh on a long-term contract from Girondins Bordeaux, the English Premier League club said on Friday.
Meanwhile, Manchester United winger Jesse Lingard says his "heart is at Old Trafford" and negotiations are ongoing over a new deal with the club that will extend a contract that runs out at the end of next season.
Arsenal battled to overcome a resilient Ipswich Town 3-0 on Tuesday before reaching the League Cup final where Arsene Wenger's men will hope to end their six-year wait for a trophy.
Images from the English Premier League matches played on Tuesday.
Arsenal forward Theo Walcott and Spanish midfielder Santi Cazorla have signed new contracts with the Gunners, the Premier League club said on Friday.
Porto beat an under-strength Arsenal side 2-0 on Wednesday to clinch top spot in Group G of the Champions League. With the two teams already guaranteed a place in the first knockout round, Arsenal manager Arsene Wenger, in his 700th game in charge of the London side, rested several first choice players and chose to field young reserves instead.
Chelsea routed title rivals Arsenal 6-0 in manager Arsene Wenger's 1,000th game in charge as blundering referee Andre Marriner was left red-faced after he sent off the wrong player in the Premier League match at Stamford Bridge, in London.
Manager Arsene Wenger has to choose between Germany's Jens Lehmann or Manuel Almunia following the Spaniard's error-prone display at Highbury.
