Per Mertesacker has slammed his side's lack of killer instinct in front of goal as hopes of silverware look to have slipped away.
The Gunners fell to their third home defeat in a row when Odion Ighalo and Adlene Guedioura struck to fire the holders out at the quarter-final stage of the FA Cup, despite a late goal from Danny Welbeck.
And the big German has admitted that Arsenal need to start taking a lot more of their chances.
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As reported by the Guardian, he said: "What we do lack at the moment is we need to score at some point. It looks like we play and play until the opposing team scores.
"That is something we need to work on. We had the opportunities and the possibilities when they were 2-0 up to come back and we kept going. You have to give credit because we kept going and created chance after chance, but at the moment, we lack that killer instinct."
Arsene Wenger's side currently sit six points behind north London rivals, Spurs, in the Premier League table and they face a daunting task on Wednesday as they travel to the Nou Camp to take on the might of Barcelona.
With their impromptu exit from the FA Cup and poor form in the Premier League the Champions League could, however unlikely, offer some salvation for a frustrated Wenger. His side will need to produce a stunning comeback from a 2-0 deficit however Lionel Messi has warned that the tie is far from over.
The player who scored a brace to beat Arsenal at the Emirates likened their style to that of the Catalan giants and warned that they have the armoury to score goals despite Mertesacker's claims.
"Arsenal have players more than capable of scoring goals. Of course we know the danger that Alexis Sanchez can bring but that is only one of many top quality players they have. The style they play is the most similar to that which we play at Barcelona and for that we have a lot of respect for them," said the Argentine.
Despite the Ballon d'Or holder's praise, Wenger is under heavy pressure and the critics are mounting as the Gunners could only muster four shots on target from their 20 attempts against the Hornets. Either way, the general consensus is they will some sort of miracle to progress to the next round and keep their season alive.