Arsene Wenger said Arsenal must improve defensively if they are to end their Premier League trophy drought.
Arsenal's quest for Premier League glory is entering its 11th season after finishing fourth in 2013-14 - five points adrift of champions Manchester City.
The London club conceded a total of 41 goals throughout the league campaign - the fourth-best defensive record behind Chelsea (27), City (37) and Everton (39).
Of the 41 goals shipped, 17 of those came against City, Liverpool and Chelsea, and Wenger is aware Arsenal can ill afford to do the same this season as they aim to win the Premier League for the first time since 2004.
"I was concerned [by Arsenal's record against the top four]," said Wenger. "I was concerned and shocked by the number of goals that we conceded.
"Of course we were Dr Jekyll and Mr Hyde defensively. We had 18 clean sheets but when we did not keep a clean sheet we let them score.
"I think it was down to confidence. Overall we were quite sound defensively but we have a good opportunity to improve that."
Arsenal's run of routs against top-tour teams kicked off against City, when they were trounced 6-3 at Etihad Stadium in December.
That result was followed by a 5-1 loss at Anfield in February and a 6-0 humiliation to Chelsea in March as Arsenal slipped down the table.
However, the Frenchman said the scoreline in Manchester was misleading heading into Sunday's FA Community Shield showdown at Wembley.
"Honestly [the Man City game was] not so much damaging because we finished with 10 men and when we looked at the game again we had six or seven chances to score," he said.
"I took a gamble at 10 against 11 like I always do to have a chance to come back, but when you look at the chances we missed, that was not a damaging [result].
"For us what was damaging was the two games at Liverpool and at Chelsea."
Arsenal open their Premier League campaign at home to Crystal Palace on August 17.
|Coach: A. Wenger|
for K. Gibbs 53'
for Y. Sanogo 62'
for J. Wilshere 69'
|Hecking ´sick´ of De Bruyne talk|
|Deschamps calls up Martial, leaves out Sakho|
|´The only thing they can is long balls´ - Midtjylland´s skipper slams Southampton|
|UEFA Europa League Review: Reus leads Dortmund rout, AZ complete late comeback|
|Messi should win Ballon d´Or - Bartomeu|
|Koeman rues refereeing decisions after Europa League defeat|
|Tottenham deal for Son not complete, say Leverkusen|
|Tuchel thrilled with aggressive Dortmund display|
|Midtjylland 1 Southampton 0 (2-1 agg): Premier League side crash out|
|Borussia Dortmund 7 Odd 2 (11-5 agg): Reus hat-trick highlights hammering|
|Cudicini tips Mourinho to avoid Porto upset|
|Anything is possible with Neymar´s future - Belletti|
|Burnley bring in Barton|
|Bayern Munich v Bayer Leverkusen: Vidal putting friendships on hold|
|De Bruyne edges closer to City move after further Wolfsburg talks|
|Real Madrid v Real Betis: Benzema back as Real look to hit the goal trail|
|Barcelona v Malaga: Rosales hopes for another upset|
|West Brom hit out at Tottenham´s Berahino pursuit|
|Stoke City v West Brom: Pulis set for Britannia return|
|Tottenham v Everton: Pochettino´s men eye first win|
|Everton reject Stones´ transfer request|
|Messi named UEFA Player of the Year|
|Pocehttino quiet on Berahino bids|
|Real Madrid to meet PSG in Champions League, Barca drawn with Leverkusen|
|Bournemouth v Leicester City: Howe eager to entertain|
|Ranieri coy on Gray link|
|Newcastle United v Arsenal: Wenger hopes for sharper shooting|
|PSG snap up Kurzawa from Monaco|
|Aston Villa v Sunderland: Sinclair aims to replicate cup form|
|Grabban a silly boy - Neil|
|Chelsea v Crystal Palace: Pardew braced to face stronger champions|
|Manchester City v Watford: Flores heads to Etihad with confidence|
|Marseille loan Real Madrid youngster Lucas Silva|
|Howe surprised by Harte´s retirement|
|Liverpool v West Ham: History counts for nothing, says Bilic|
|Bolasie set for Palace comeback|
|De Bruyne to City not a done deal - Allofs|
|Sevilla complete Llorente swoop|
|Wenger supports video technology|
|Milan v Empoli: Zapata sets sights on ´must-win´ fixture|
|Watford boss Flores ´not happy´ with transfer situation|
|Balotelli: I am no longer a kid|
|Bilic has no issue with Valencia|
|Arsenal ´not close´ to any late deals|
|Balotelli finalises return to Milan on loan|
|West Ham confirm Nolan departure|
|Thiago signs new Bayern deal|
|Schmidt saddened as Son nears exit|
|CONCACAF Champions League Review: Sounders lose in Honduras|
|Van Gaal considered early Herrera substitution|
|MLS Review: Fire stun Red Bulls|
|Carroll nears West Ham return|
|Rodriguez hoping for England recall|
|Leverkusen can challenge best - Schmidt|
|Ozil defends United recruit Schweinsteiger|
|Sporting ´better over two legs´ - Jesus|
|Stoilov revels in historic Astana triumph|
|Pioli: Lazio not ready for Champions League|
|UEFA Champions League Review: Rooney nets treble and Astana make history|
|Everton to reject Stones´ transfer request - Martinez|
|Barnsley 3 Everton 5 (aet): Delightful Deulofeu spares blushes for Martinez´s men|
|Van Gaal lauds Rooney character|
|Rooney delighted to be back in the goals|
|Club Brugge 0 Manchester United 4 (1-7 agg): Rooney ends goal drought with hat-trick|
|Juve striker Llorente undergoing Sevilla medical|
|Blanc confirms imminent Kurzawa switch to PSG|
|AFC Champions League Review: Lima gives Al Ahli the edge, Jeonbuk Motors and Gamba Osaka draw|
|Wanyama out of Euro tie with stomach infection|
|Digne joins Roma on loan from PSG|
|Monaco agree deal for Real´s Coentrao|
|Wolves reject third Norwich bid for Afobe|
|Valencia clarifies West Ham criticism of injury treatment|
|O´Neill hands duo Northern Ireland recalls|
|Illarramendi makes Sociedad return|
|Arsenal a player away from dominance - NBA star Deng|
|Godin ´always wanted´ Atletico stay|
|Schalke reject Roma´s Kolasinac bid|
|Injured Allen omitted from Wales squad|
|Bellerin ready for Debuchy battle|
|Valencia lashes out at West Ham treatment|
|Van Dijk hints at Celtic exit|
|Everton legend Gray resigned to Stones exit|
|Negredo: Suffering is in the past|
|Commons and Gordon reject Deila critcism after Celtic defeat|
|Neil remains defiant on Bournemouth target Grabban|
|Happy Milner optimistic about Liverpool chances|
|CONCACAF Champions League Review: DC United, Saprissa preserve perfect records|
|Tomkins eyes West Ham recall|
|Di Maria, Pastore out of Argentina squad|
|Schmidt unfazed by Lazio injuries|
|Pique hits back at Barca critics|
|Hurt Traore a ´marked man´ - Sherwood|
|Wolves reject second bid for Norwich target Afobe|
|Pardew fears ´long term´ Jedinak injury|
|Hughes thrilled with Bojan return|
|Maccabi´s Europe feat ´the high of highs´ for Ben Haim|
|McClaren expecting big things from Thauvin|
|Lucescu calls for Shakhtar improvement in group stage|
|Watford will learn from loss - Flores|
|Nuno revels in Valencia´s Champions League qualification|
|Advocaat unhappy despite win|
|League Cup Review: Preston claim Watford scalp, Luton lose shoot-out to Stoke|
|UEFA Champions League Review: Valencia make history for Spain, Celtic dumped out|