Swansea City say its defender Rhys Williams was allegedly racially abused during his side's Championship match away at Luton Town.
Williams, 20, is on loan for the season from Premier League giants Liverpool. He was substituted at half time when Swansea were losing 3-0.
A club statement from Swansea City after the match said: "Towards the end of today’s Championship fixture against Luton Town at Kenilworth Road, an allegation of racial abuse was made over comments made towards Swansea City’s Rhys Williams from a home spectator.
"An official report was filed with the match official, Tony Harrington, and Bedfordshire Police at full-time".
The Swans ended the match in dramatic fashion, scoring two late goals including one in stoppage time to take a point with a 3-3 draw.
After the game Swansea City said it condemns racism of all kinds and thanked local police and Luton Town football club for their "swift response" at the end of the game.
Bedfordshire Police has launched a full investigation into the incident. Officers have been to the ground to carry out enquiries and are working with Luton Town to identify the people involved.
Luton Town football club said it is offering Rhys and Swansea their full support and said anyone who is found to have made discriminatory comments will not be welcome back at their stadium.