West Ham boss David Moyes knows they face a massive test at Everton.
It marks a return to his old club for Moyes on Saturday.
Moyes said, "They gave me a start and the chance to make mistakes. We grew the club, and I hope people will look back and think we did well.
"The biggest thing I took from my time there was the players. We had brilliant players, who were brilliant to work with. I have great memories of that place, and I'm looking forward to going back tomorrow.
"Losing the points must have been a huge disappointment, but I couldn't tell you what that's like because I haven't experienced it. I'm sure they'll be well up for the game tomorrow."