West Ham manager David Moyes revealed after the match that Aguerd's ankle wasn't broken, but he was unsure how long the £30million signing would be out of action for.
It had been hoped the 26-year-old would be fit for the first match of the season against Manchester City, but on Monday the club revealed that the Moroccan international had 'successful surgery' on his ankle and wished him a 'speedy recovery'.
Although the full extent of the operation was not revealed by West Ham, medical experts believe that 4 to 6 weeks of recovery is needed for an ankle ligament issue.
This is Aguerd's third ankle injury in three years. He ruptured ankle ligaments at Dijon and was out of action for two months in the 2019/20 season, and missed one match with an ankle knock while at Rennes in December 2021.
West Ham now have a selection issue at centre back with Craig Dawson out of action for personal reasons, Angelo Ogbonna slowly recovering from a long-term cruciate ligament injury and Issa Diop also on the way back from a ligament issue. That leaves Kurt Zouma as the only experienced first team player in that position.
Moyes has experimented with using versatile full back Ben Johnson at centre back, and has tried Aaron Cresswell and Vladimir Coufal as part of a back three.
More to follow… This is a breaking news story that will be updated with more information shortly.
Planet Sport is your home of breaking news across all sports, and you can also access all the latest live scores in our dedicated live centres. Find out more about the team behind Planet Sport, your world of engaging sports content, here.