Norwich have promised to ban anyone found to have racially abused boxer Anthony Ogogo during the Carabao Cup defeat at Arsenal.
London 2012 Olympic bronze medallist Ogogo was at the Emirates Stadium on Tuesday night to support the Canaries.
The 28-year-old middleweight grew up in Lowestoft and had a spell in Norwich's youth squad.
He used a friend's ticket and was sitting in the Arsenal end as he applauded his team off the pitch.