The match yesterday was temporarily halted in the 85th minute when academy graduate Earthy, who had just made his league debut as a substitute, went down after colliding with teammate Edson Alvarez.

The 19-year-old was taken off the pitch on a stretcher before being taken to hospital. The club said he would be subject to the FA and Premier League’s concussion guidelines ahead of his return.

“George is back home and we will continue to monitor him over the coming days as he completes the graduated return to play programme,” Richard Collinge, the club’s performance director, said in a statement.

West Ham host newly crowned Bundesliga champions Bayer Leverkusen in the return leg of their Europa League quarterfinal on Thursday. They trail the German side 2-0 from the first leg 2-0.