Clint Hughes/Associated Press
At some point, every Liverpool match becomes Suarez against one of the centre-backs. Arsenal will surely try to ensure that, as far as possible, it's Koscielny rather than Per Mertesacker who picks up Suarez, given the German's lack of pace; certainly if Mertesacker is ever isolated with Suarez running at him, Arsenal are in trouble.
The partnership between Koscielny and Mertesacker has been one of Arsenal's great strengths this season. But their strength is in one picking up a lone central striker and the other covering; against a strike, pairing the dynamic is very different and, if the cover in front of them is less secure than usual, that could be an area Liverpool can exploit.
Much, though, will depend on what happens elsewhere in midfield: Back in November, Suarez and Sturridge spent most of the game watching Arsenal boss midfield, which meant they never got anything like the service they required.