Arsene Wenger has warned Arsenal must be "switched on" from the moment they step out in front of 40,000 fans at Elland Road on Wednesday night - or face being dumped out of the FA Cup.
The Gunners boss is again expected to rotate his starting XI for what will be their sixth fixture of a congested January after needing a last-minute penalty from captain Cesc Fabregas to deny the npower Championship side a famous win at Emirates Stadium 10 days ago.
"The speed of our display, the speed of thought, the sharpness of our game has to improve," he said. "We want to be sharper and more positive, we started the game a little bit off our usual level. That means first, mentally, of all you want to switch on much quicker."
Arsenal have a fine away record this season, and can certainly expect a testing atmosphere at Elland Road, a venue which not so long ago hosted such showdowns on a regular basis.
Wenger, though, feels his squad will not suffer from stage fight.
"No matter what they do, the fans will be behind the team at Leeds. On the other hand, we are used to that and that would not be any excuse for us," he said.
"We have played all over the world, everywhere, in vociferous stadiums. I don't think that will be any excuse for us, it's natural and normal.
"What's important is that you show your quality no matter in what kind of environment you play."
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