West Ham midfielder George Earthy is in hospital after suffering a head injury on his Premier League debut against Fulham.
The 19-year-old had came on in the 82nd minute at the London Stadium as a replacement for Michail Antonio.
However, Earthy was taken off on a stretcher in stoppage time, with Maxwel Cornet coming on.
West Ham confirmed that Earthy is awake in hospital.
A statement from West Ham read: 'West Ham United can confirm George Earthy will undergo an assessment in a London hospital this evening following the incident which saw him stretchered off during today's Premier League fixture against Fulham.
'The midfielder - who entered the field as a second half substitute to make his Premier League debut against the Cottagers - was taken off in stoppage time.'
Manager David Moyes said: 'George has suffered a head injury.
'He's awake and has been taken to hospital for further assessment.'
West Ham United will provide a further update in due course.
Earthy was given oxygen on the pitch and received treatment for six minutes after he collided with West Ham team-mate Edson Alvarez.
Fulham won 2-0, with Andreas Pereira scoring both goals for the visitors.
It was a second senior appearance for Earthy, who featured as a substitute in West Ham's Europa League win at home to Freiburg last month.
A product of West Ham's academy, Earthy was part of the West Ham U18 team that won the FA Youth Cup and the U18 Premier League South last season.
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