West Ham boss David Moyes says they face a battle on Sunday against Everton.
The Irons go into the game on the back of a Europa League defeat at Olympiacos.
Moyes said: "We've got ourselves back and will get ourselves ready for it.
"Every Premier League game is difficult and we'll approach it as we approach every other game.
"Everton are a hard nut to crack, they've probably played a bit better away from home this season. I don't see teams beating them easily, I see a resilient team who keep at it and they have players capable of scoring goals.
"I think Sean (Dyche) has done a brilliant job keeping them in the Premier League last year when it was the toughest I can remember on the relegation side. Congratulations to him for that.
"It looks as if it might be a difficult period at Everton right now with the financial situation, but he's steering them through it."