A fan is the subject of an investigation by Norwich after alleged racist comments were directed at Crystal Palace players during Tuesday's 3-0 defeat at Selhurst Park.
The club have also reported online racist abuse aimed at some of their own players to Norfolk Police and have pledged to impose 'the strongest possible sanctions against perpetrators of this behaviour'.
'Following our game at Crystal Palace, the club were disappointed to learn of both online racist comments directed at some of our players, as well as alleged in-stadia racist comments directed at opposing players by our supporters,' said a Norwich statement.