Tottenham Hotspur and Crystal Palace are working with London's Metropolitan Police to investigate an allegation of racial abuse towards Son Heung-Min, both clubs said on Sunday.
Videos on social media appeared to show a fan at the Tottenham Hotspur Stadium making a racist gesture towards the South Korea forward as he walked past Palace fans after being substituted in Spurs' 1-0 win in the Premier League on Saturday.
"We are aware of a video circulating online (as well as reports made directly to us) regarding an individual in the away end at Spurs yesterday, appearing to make racist gestures towards Heung-Min Son," Palace said in a statement.