Kromkamp believes the Reds have weaknesses and said the Reds' style of play was ugly.
"We know how to get at Liverpool. They have plenty of weaknesses. They often revert to kicking long ugly balls up to Peter Crouch. If you block them from deep they soon lose their rhythm and start playing those long balls up to Crouch," he said.
He added, "In one-on-ones, the two in the middle of defence are very good, but they cannot contribute to Liverpool's build up play. So we will focus on that."