Arsenal say they have identified an image of the person who threw a bottle at Tottenham's Dele Alli on Wednesday and are "embarrassed" by the incident.
England midfielder Alli, 22, was struck on the head by a plastic bottle during Spurs' 2-0 win in the Carabao Cup quarter-final at Emirates Stadium.
Police are investigating the incident.
"Anyone identified will receive a lengthy club ban and their details will be passed to the police to commence legal proceedings," said the club.
Alli was hit by a bottle thrown from the crowd as Arsenal prepared to take a throw-in in the 73rd minute.
Read More