The other big surprise was benching Aaron Ramsey and starting the rather awful Granit Xhaka in his place.
"I don't think Arsenal created much, we created twice as much as them".
The offical line was that the former Germany worldwide was ill, but it is believed the 29-year-old had a row with the club's new head coach, Unai Emery, and left the Arsenal training ground on Friday.
Pellegrini is still bedding into a new job and £100m worth of new signings to integrate, West Ham will grow in chemistry and performance as their talent find their feet.
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While the east Londoners are still looking to get off the mark this season, Pellegrini is seeing signs of life at the club.
Mohamed Salah has struck again to ensure an underpowered Liverpool maintained their ideal early-season record in the 1-0 win over Brighton & Hove Albion at Anfield and climbed to the top of the Premier League.
"But also the strikers, they are going to do more than other players".
Aaron Ramsey nodded in the rebound but was flagged offside, before West Ham broke and Arnautovic arrowed an effort into the side-netting.
West Ham's third successive defeat under new manager Manuel Pellegrini makes it the worst start by a Hammers boss since Avram Grant lost his opening four league games of the 2010-11 season.
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This NASA file image obtained August 20, 2018 shows Hurricane Lane when NASAs Aqua satellite passed overhead in mid-August 2018. The long and short of it: It's still too soon to know the impacts, if any, the storm will have on any of the islands.
"Yeah he was ill and yesterday we decided with the doctor and with him that he would not play".
"Today, he was progressing like the first two weeks, very positive".
It would be interesting to see the fire in a player, who despite wanting to stay at Arsenal, was seemingly pushed out and this is going to be a chance for him to prove his former employers wrong on many levels.
"We need to keep believing, we need to keep playing that way attacking-wise, creating chances and we'll definitely take them".
Speaking after the game, Emery insisted reports of a bust up were untrue, saying: 'It isn't true, that information.
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The red flag period after this incident is still in effect, as track officials attempt to fix the heavily damaged catch-fencing. There wasn't another caution the rest of the way, and Rossi closed the gap on Dixon in the points race with a dominant win.