The Gunners boss says the mistakes made to concede the goals - two of which were own goals - in the 4-3 defeat by Blackburn on Saturday were down to basic errors.

Asked what lay behind the leaky defence, Wenger said: "A lack of concentration, a lack of communication, a lack of co-ordination and individual urgency.

"When you score an own goal, you have to look at yourself. It is never completely out of your reach where you have no chance at all. All the rest, you have to look at yourself.

"The Blackburn game is very disappointing and frustrating. I must say that the disappointments and frustrations are huge.

"We feel that we have given this game away, not that we have lost the game. There is nothing worse in our job than having that feeling."

Wenger said the Gunners were now at a point that could prove decisive for their whole season.

He added: "I personally want to focus on the positives because there is huge potential in this team. We had 22 shots on goal, 61% of the possession.

"Our season depends now on how well we respond to this disappointment and how quickly we can cut out the mistakes we made on Saturday by giving away goals that we should never give away."

Wenger will field a youthful line-up alongside some older heads as Arsenal aim to avoid an unthinkable shock in the Carling Cup third round against Shrewsbury tomorrow night.

Wenger confirmed he will give a debut to Korean striker Park Ju Young while Japanese forward Ryo Miyaichi and fellow 18-year-old Alex Oxlade-Chamberlain can also expect to make their first starts.

Wenger said: "I will be faithful to our policy but I will try to find a good mixture between youth and experience.

"You will see the likes of Ryo and Oxlade-Chamberlain. You should be excited about Oxlade-Chamberlain because he is a great talent. My target is to develop him so he confirms the expectation I have for him."

The more-experienced players likely to feature at the Emirates include Andre Santos and Marouane Chamakh, while Emmanuel Frimpong, Carl Jenkinson and Francis Coquelin may also play.

Meanwhile captain Robin van Persie claims Arsenal still have time to turn their season around despite the club's worst league start for 58 years - underlined by losing 4-3 at Blackburn on Saturday despite being 2-1 up and apparently in control.

Van Persie told the club's website: "There is lots of time, but at some point you need to pick yourself up and prove what you are capable of. We are not doing that at the moment and are not consistent enough.

"It just frustrates me, and it is happening too often. Every time we start positively we just keep making the same mistakes and that is surprising.

"We just need a couple of good weeks in the Premier League where we get a lot of points, and hopefully we can start next week against Bolton."