Zouma initially kept his place in The Hammers’ side for the win against Watford despite calls for him to be dropped after a distressing video emerged of him physically mistreating his cat.
The 27-year-old has since been fined and his cat has been taken away by the RSPCA.
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"Kurt was not well and was sick during the night,” Moyes said. "He did not eat with us today and stayed out of the [team] meeting.
"We did that not just because we were worried in case it was a symptom of Covid but he was sick and just could not make it – although he was really desperate to play.”
Moyes still expects Zouma to return to the West Ham side against Newcastle United on Saturday (12:30pm kick-off). The Magpies head to the London Stadium having won each of their last three Premier League matches. Elsewhere in the West Ham squad, left-back Arthur Masuaku could be ruled out for the rest of the season with a knee injury.
The 28-year-old hasn’t featured in West Ham’s last two matchday squads.
And well-known club insider ‘ExWHUemployee’ revealed on The West Ham Way Podcast: “He’s got his ongoing knee injury which needs to be investigated by experts [as to] whether he can play. He might even be ruled out for the rest of the season, but I don’t know yet.”