West Ham boss David Moyes is eager to build on their form hosting Chelsea in today's early kickoff.
Moyes spoke about building on momentum following a draw over Newcastle United last time out.
On Chelsea's newly-assembled team, Moyes said: "It can take time for players [to adapt to the Premier League].
"I can tell you that with us bringing in new players last summer. But I think when Chelsea spends 600 million, it should give them half a chance really.
"But money isn't the only thing with football, you've got to get the team right.
"You've got to get all the other parts of it going well. So, hopefully, we can give Chelsea a good game. Obviously, they're a really good team. They've got some really talented players they have brought in, but they will need time to gel just like the ones we brought in last summer.
"No, we have not forgotten [about the last meeting against Chelsea].
"It was a right rotten decision by the officials on the day. And they've admitted to that. But it does have an effect on you, it was a really important time in the season for us. The difference between picking up a point, and what that would have done for us in terms of confidence and morale at that time. It was a huge mistake.
"We can have a good season; we've still got a lot to play for.
"We're showing better signs in areas but we're going to be challenged by good teams like Chelsea, we're going to be challenged in the European competition, which we're going to do again in March.
"We're also in the next round of the FA Cup, so we want to try and keep ourselves involved in as many tournaments as we can. But our focus is solely on the Chelsea game and trying to do the best we can against Chelsea."