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A win for Chelsea would see them move back into the top four, at least temporarily. The Blues have failed to beat West Ham in their last three Premier League meetings.
West Ham have won four and drawn one of their last five Premier League London derbies.
Chelsea are unbeaten in their last six league matches at Stamford Bridge, while West Ham have failed to win any of their last seven matches on the road.
I feel sorry for West Ham manager Manuel Pellegrini. He puts his team out one week and they are are really, really good. They look like a good top-10 side.
And then the next match they look like they have never met each other.
People might question Pellegrini's ability to motivate his players, but it can't be that. He will say the same things every week to get them going, and one week it works and the next week it doesn't.
I just don't get it - but it makes it very hard to predict the Hammers' results, whoever they are playing.
Chelsea have also been inconsistent this season, although not on the same level.
They come into this game on the back of two successive wins and, after being fortunate to beat Cardiff at the weekend, they were far more convincing against Brighton on Wednesday.
Blues boss Maurizio Sarri picked an interesting team against the Seagulls, with Callum Hudson-Odoi and Ruben Loftus-Cheek both starting, and after a performance like that why would you not start them both again?
If he leaves them on the bench on Monday then straight away the fans are going to be singing: "You don't know what you're doing."
Maybe Sarri is already thinking he won't be in charge beyond the end of the season so it does not matter. It does, though, because if he gets them in the Champions League it will go down as a good season for a new manager, whatever happens after that.
There seems to be a lot going on behind the scenes at Stamford Bridge, so if Sarri can secure a top-four finish then I would say that is a success.
Source: BBC