LONDON -- The Football Association (FA) is aware of alleged racist chanting by Millwall supporters in Sunday's 6-0 defeat at Tottenham Hotspur in the FA Cup quarterfinal, but it will wait for information from the match officials, police and both clubs before deciding on any action.
Tottenham forward Son Heung-Min, who is from South Korea, was subjected to chants of "DVD" and "he's selling three for a fiver" from sections of the away support, numbering around 3,700, at White Hart Lane -- a racist reference to his ethnicity.
Son scored a brilliant hat trick in a comfortable Spurs win that was marred by a serious-looking injury to striker Harry Kane.
A source at the FA said it has launched an active investigation into the chanting but the governing body will wait for the referee's report, as well as information from the police and both clubs before deciding whether to punish the League One club.
Millwall manager Neil Harris said the club "would not condone" the behaviour and described it as "wrong in society" after the first competitive meeting between the London rivals since 1990.
"I didn't hear anything. Me personally, but the club also, we won't condone that," Harris told a postmatch news conference.
"We came here in the right spirit, to enjoy an FA Cup quarterfinal, so if that's proven to have been to the detriment to the competition ... I'm sure it will be left to the authorities. We just want people to enjoy the game."
Asked if it was a shame to be talking about supporters' conduct after Millwall's superb cup run came to an end, Harris said: "Yes, of course. For both of us.
"[Tottenham manager] Mauricio [Pochettino] wants to be talking about his team's quality. The focus comes away from what we've achieved in the competition. It's wrong in society, and it's wrong in football."
Harris headed straight down the tunnel at the final whistle and he added: "I wanted to say thank you to the fans for their support today and all through the competition, then straight down the tunnel because I was disappointed with the scoreline.
"We came here today inspired by what the FA Cup is about, and about what we'd achieved in previous rounds. We thought this could be another one, a major upset, one of the biggest of all times.
"But we were realistic enough to know they could cause us problems. They embarrassed Stoke in the first half, and I saw the gulf between Spurs and Everton. The scoreline didn't do that game justice. I thought they were outstanding today."
Leicester City complained to the FA about "abuse, provocation and intimidation" of their players, supporters and staff in Millwall's last-round win over the Foxes at The New Den.
In 2005, Paul Ince -- then manager of Wolverhampton Wanderers -- described chants of "DVD" aimed at Seol Ki-Hyeon, who is from South Korea, by Millwall fans as "disgraceful," after Seol scored the winner in a 2-1 victory.