Cool said: "It's going to be a very tough game for us. Liverpool are a quality side and are very direct and physical.
"Guy Roux has warned us about Owen and Heskey but all the Liverpool players will be capable of making an impact on the game.
"Sami Hyypia is an excellent defender and Riise has got plenty of goals this season so I don't think we should just focus on the strikers.
"We can't let ourselves think about the next round because we know we have a mountain to climb to beat Liverpool."