Arsenal suffered an injury blow during their Europa League tie against Sporting on Thursday as Danny Welbeck was forced to leave the pitch on a stretcher.
Welbeck, who scored the winning goal in the reverse fixture in Portugal, was replaced by Pierre-Emerick Aubameyang in the 29th minute of the game.
The Arsenal forward was challenging Sporting full-back Bruno Gaspar for a header when their legs tangled and Welbeck landed awkwardly on his ankle.
Welbeck was quickly surrounded by his team-mates, with Matteo Guendouzi visibly shocked by the incident, before receiving oxygen and being carried from the pitch.
Following the match, which finished scoreless, Unai Emery confirmed that the forward had been sent to the hospital.
“He has been taken to the hospital. We are going to wait [for updates].”