Manuel Almunia feels Arsenal need to 'give more' in games if they are to have any hope of challenging for the Premier League title.
The Spanish shot-stopper feels the Gunners are underachieving after lacklustre performances led to a 2-0 defeat to Porto in the UEFA Champions League and also being dumped out of the Carling Cup by Burnley.
With five losses already in the Premier League, the fourth-placed side travel to Middlesbrough, live on Sky Sports 1 & HD1 from 12.30pm, knowing that a sixth defeat could prove fatal for their dreams of lifting the Premier League title.
"We have to realise that to wear an Arsenal shirt is a big value and you have to be worthy of the shirt," he told the Daily Star.
"We are so upset. We are not happy with this season.
"We have had some brilliant moments, beating Chelsea and Manchester United - but it's not enough.
"We've already had too many defeats."
The 31-year-old is not the only Arsenal player to vent his frustration with William Gallas criticising his team-mates, ultimately leading to the Frenchman being stripped of the captaincy.
But Almunia was quick to defend the hot-headed defender, adding: "I think William has his opinion and it's for the players to react and give more.
"I have confidence in us and the way we play.
"We should have more character on the pitch. We need to be more aggressive and give more."