Liverpool boss Brendan Rodgers says West Ham United will meet a different team at Anfield.
The Hammers defeated Liverpool earlier this season.
"It's a different team and a different mentality," Rodgers said.
"I think at that point in time we were struggling. We were trying to play with the same flow and the same rhythm, but we just couldn't find it at that time. I think you see now the confidence in the team. I think we've returned to the top level.
"Our only improvement that we need to make is that efficiency in the final third. How we arrive there and how we get there and the speed and how we create the chances is there. But we just need to be more efficient once we get in, and hopefully that will come."