Tottenham Hotspur are investigating an alleged incident of racism by a supporter towards South Korean forward Son Heung-min during Sunday's Premier League loss to Manchester United.

The north London club confirmed on Monday (Tuesday AEDT) they were conducting an internal inquiry after a supporter, James Dickens, said he had confronted someone in the home end at Wembley over abuse aimed at Son.

"Whilst the incident occurred in the home end, we are yet to determine if the alleged individual was a Tottenham Hotspur supporter or not," a Spurs spokesman said.

"Any kind of racist, discriminatory or anti-social behaviour will not be tolerated by the club.