William Gallas and Kolo Toure will both miss the Champions League clash with Fenerbahce on Tuesday.
“I am very proud,” said Almunia. “It is a great thing to wear the armband. I am a bit surprised because I am the oldest player on the pitch.
“It is nice. It means that I am doing things well and I have the confidence of the boss.
“I will try to defend Arsenal 100 per cent and try to help my team in every aspect.
“The only pressure is as it is on a Saturday every weekend – to defend my team.
“I have more responsibility being captain, but there is no pressure.
“It is a pride for me. I hope I can support my team from behind and command my defenders very well to get the points.”