Crystal Palace visit West Ham United on Saturday attempting to extend their longest Premier League winning streak in almost twenty years.
The Eagles (12-4-18) secured their fourth straight win on Wednesday when they stunned Champions League hopefuls Everton 3-2 at Goodison Park.
The victory over the Toffees took Tony Pulis's side to the mythical 40-point mark, all but guaranteeing top-flight football for next season.
"It is nice to say we are going to be a Premier League club next year with four games to go," Pulis told the official club website.
Pulis has overseen 11 wins in 23 league games, beginning with a 1-0 win over Hull City in his first match in charge, after replacing Ian Holloway as manager in November.
"I started at Hull and we had four points," Pulis said after the Everton match. "Now we have 40. It is a remarkable achievement from the players - they have been absolutely fantastic.
"I'm proud of them. I've just had a chat with them and said that without their effort and buying into what we're trying to do, we wouldn't have achieved it.It's brilliant - I am absolutely delighted for the supporters and the football club."
Having won four straight matches for the first time since November 1994, Palace are looking to record five straight top-flight wins for the first time since December 1992.
West Ham (10-7-17) face their second consecutive London derby after losing 3-1 to Arsenal on Tuesday despite taking the lead through a Matt Jarvis strike.
Hammers boss Sam Allardyce admits he is expecting a tough game against Palace.
"It's just as difficult a game and tactically it will be different because they obviously play a very good defensive and then counter-attacking game away from home," Allardyce told his club's website. "We have watched them and it will be extremely difficult to break down, so we will have to be very patient in how we approach the game and not get frustrated about the opposition making life difficult for us, which they definitely will."
Only five teams have allowed fewer goals that Palace (41) in the division this season. The Eagles have actually conceded fewer than leaders Liverpool (42).
A win against Palace would all but secure safety for the Hammers who lie in 12th place, three points behind Saturday's opponents, but Allardyce will take any kind of result as his side battle to beat the drop.
"Hopefully we will produce enough quality to breach their outstanding defensive work that Tony has put together with his team and get the goals to win the game," he said."One thing is for sure, if we can't win it we need to make sure we don't lose."
West Ham will be without Marco Borriello (shin), while Palace are missing Kagisho Dikgacoi (hamstring).
The Eagles won the reverse fixture at Selhurst Park in early December 1-0 through a goal from Marouane Chamakh shortly before half-time. That was the first top-flight meeting between the sides since 1998.
Palace's last victory at Upton Park dates back to April 1992, when they won a First Division match 2-0.