Bedfordshire Police are investigating after Swansea City's on-loan Liverpool defender Rhys Williams was allegedly racially abused by a Luton Town fan.
Bedfordshire Police "interviewed a man voluntarily in connection with the incident", which Swansea say happened towards the end of their 3-3 draw.
Williams, 20, was substituted at half-time of the match on 18 September.
Swansea made an official report to match official Tony Harrington and Bedfordshire Police.
In a statement, Bedfordshire Police confirmed the investigation is "ongoing".
Swansea thanked the force and Luton for their swift response at the end of the Championship game.