Arsenal forward Danny Welbeck was carried off on a stretcher after suffering what appeared to be a serious ankle injury during the Europa League Group E match against Sporting Lisbon.
Welbeck, 27, was hurt in the 25th minute at Emirates Stadium and received oxygen and had his leg in a protective brace as he was carried off the pitch.
It came after he jumped for a header and landed badly on his right ankle.
There were up to 10 medical staff around him as he received treatment.
Some of his team-mates were also visibly affected by the incident.
Welbeck has scored five goals this season, played for England against Spain in September and had been named in Gareth Southgate’s latest squad for the Nations League match against Croatia and the friendly with the United States.
Arsenal, who are fifth in the Premier League and unbeaten in 14 games, will qualify for the last 32 of the Europa League with a win over Portuguese side Sporting.
More to follow.