Arsène Wenger will make a late decision over the formation for tonight's Champions League second leg against Real Madrid.
Though most Gooners and Wenger himself prefer 4-4-2, he has changed to 4-5-1 on a number of occasions this season. The formation was used to great effect in the Bernabeu a fortnight ago when we were unlucky not to win by more goals.
At home though it is rare to see 4-5-1, the exception this season being against Manchester United in January.
At the press conference Wenger said:
It is about finding the right balance,
One goal is a good cushion, but also not much of a cushion at all. It is just a result which dictates them to have a go at us.
You cannot play 90 minutes and think we will just defend that goal - the lead is just not big enough.
But we have a system which is very flexible because Jose Antonio Reyes can play as the second striker, or can play as a winger.
I am still not completely decided on that because Real Madrid may change their system as well. We may adapt a little bit to their system. 
Its funny but the confidence I had after the first leg has now gone as we get towards kick off and has now been replaced by nerves. I know we can win it, but doesn't stop me shitting myself now !
Come on Gooners !
The betting odds for the game are;
Arsenal to win 6/4
Draw 9/4
Real Madrid to win 17/10
To place a bet click here