Arsène Wenger afforded himself the luxury of withdrawing top-scorer Thierry Henry after an hour of Saturday's encounter with West Brom - but admitted he has no such option in defence.
Due to the continued absence of a clutch of rearguard regulars, Wenger will once again rely on the 'makeshift' back-four of Emmanuel Eboue, Kolo Toure, Philippe Senderos and Mathieu Flamini for Wednesday's Champions League Semi Final first-leg with Villarreal at Highbury.
And the Gallic coach added he must find the right balance between youth and experience when facing the surprise, Spanish semi-finalists.
"The only thing I can say is that in the defence we are young and at the moment there's no change there because there's no other possibility," he said.
"That means the rest of the team has to help out well in the defensive job because Villarreal are a team who keep well the ball. Every time you win the ball you have to play in an intelligent way and you need therefore, a lot of experience.
"We'll need everybody of course. You need players like Dennis [Bergkamp] and [Robert] Pires - maybe on Wednesday night, I don't know yet, but you have to get the mixture right."
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