Former West Ham manager Alan Pardew returns to Upton Park for the second time this season, with current Hammers boss Sam Allardyce knowing full well what Pardew's teams are capable of.
Both Allardyce and Pardew have something in common in they took on the 'impossible job' at Newcastle United.
Big Sam only lasted one season at St. James Park, while Pardew spent five years at Tyneside between 2010-2015, which included a season in the Europa League, before being persuaded to join his beloved Crystal Palace earlier this year.
Like Pardew, Big Sam also battled against Newcastle United fans' discontent with the performances on the pitch. However, Allardyce said that Pardew's stint with the Magpies was a successful one.
Allardyce said: "I wouldn't say he had a torrid time. He had a very successful spell in his reign. There are times at Newcastle where if things don't go well, the fans express their disappointment. The thing about the Newcastle fan is they don't stay away, they still turn up. If you're not doing well, they'll let you know.
"Overall, Pardew's reign at Newcastle was very good. Newcastle are a team that fit in and around mid-table in the Premier League, but there's a greater expectation at that club.
"Realistically, where they are financially, that's where they should be and Alan has always kept them in that position. He had one very good season where he got them into Europe."
The Hammers have failed to pick up a win since victory over Hull on January 18 and are winless in their last five. The Eagles are in a similar run of form as Pardew is experiencing his first blip as chief of the Selhurst Park club with just one win in five games in all competitions.
Despite both teams inconsistency ahead of the early kick-off on Saturday, Allardyce said that the main threat from Palace will be the quality of their midfielders.
The former Blackburn Rovers gaffer said:" They could come here and play counter attacking football. Looking at how they've set up away from home recently, I think in wide areas they have good counter attacking players in Jason Puncheon, Yannick Bolasie and Wilfried Zaha.
"That might be the way forward for them. They have Yaya Sanogo which gives them another dimension to play off.
"It will be a tough fixture for us, but our home form is good and our form in general is good. It's just our results that's been the big disappointment in terms of what we've achieved recently. Particularly the last three game have been magnificent in terms of performance, but we sit with three points instead of seven.
"Just a few seconds have taken points away from us against Manchester United and Tottenham Hotspur. We now need to turn a good performance into a victory on Saturday."
Most of the West Ham players are still hurting after last week's heartbreaking Harry Kane equaliser in a 2-2 draw at White Hart Lane. Allardyce said that it is vital that the players clear there mind and focus on getting maximum points against another one of their London rivals.
The former Bolton Wanderers gaffer said: "It's just a huge disappointment for us. The players have to take a lot of credit for the performances, but the ultimate goal is we've slipped out of the elite area of the Premier League.
"Knowing full well that I could be saying that we beat Manchester United, drew with Southampton and beat Tottenham 2-1, we were less than a minute away from doing that, and would be sat in the top six now with 44 points instead of 39 points and just out of that top six.
"It's a massive disappointment. We are in a good position, but we've just lost the opportunity to put pressure back on that elite group. We've slipped up on that by conceding in the last remaining seconds of a game. The Crystal Palace game becomes even more important now."
After West Ham academy graduate James Tomkins penned a new deal at the club last week, another player to come through the youth system also did the same. Midfielder Mark Noble signed a new five year contract with his boyhood club which will keep him in east London until 2020.