Jamie Carragher names big difference about Chelsea FC under Maurizio Sarri

The Italy global followed new Chelsea manager Maurizio Sarri to Stamford Bridge from Napoli in a £57 million earlier this summer, and the 27-year-old has been an integral part of the Blues climb to joint top of the Premier League table.

The Hammers were initially confident that Arnautovic, 29, would be fit to face Chelsea, but Pellegrini has issued a cautious update.

'Marko finished with a problem behind his knee, ' said Pellegrini.

'We will see if he is fit for Sunday.

Midfield metronome Jorginho has played more passes than any others player in the English top-flight so far this season, with Carragher lavishing praise on the Chelsea star.

West Ham look set to be without fellow striker Javier Hernandez as the Mexico global is still struggling through illness.

The Blues left London this afternoon and have arrived in Thessaloniki to prepare for Thursday night's Europa League group stage opener but it looks like Sarri has chose to rest a few of his key men for the game as Hazard wasn't among the travelling party.

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Jack Wilshere has undergone surgery on an ankle injury, West Ham have confirmed.

Razvan Lucescu's side will enter the match having won three of their last four matches in all competitions, but the defeat during that run - at home to Benfica - saw them fail to make the group stage of the Champions League.

Chelsea now sit at the top of the table but Pellegrini insists he is "confident" that his team can trouble the Blues.

He said: 'It's impossible to start better than Chelsea have. We have to go step by step and just try to win the next game.

Off the back of the triumph at Everton, he told West Ham's official app: "We really needed this victory a lot, we suffered a bit but as it happened in the games we lost we were united and we knew that victory would come".

'We have our first one with Chelsea, who are top of the table, which is big motivation'.