After Messi Chelsea's Cahill now ready for Arsenal ace Van Persie
"He's a different sort of challenge to Messi but just as difficult. His left foot is amazing and he's scored goals from everywhere this season - volleys, headers, long-range shots and tap-ins.
"He shoots on sight if he gets even half a yard and a lot of his shots have been hitting the back of the net.
"But it's vitally important to get a result at Arsenal to get us back into the running for fourth pace. The games are coming thick and fast now and every one is like a cup final that we cannot afford to lose.
"We enjoyed the result Wednesday night, but on Thursday morning we were back at the training ground and focusing on an early Saturday kick-off. It's just pick yourself up and go again."