Garath McCleary was the target of alleged racial abuse from a fan during Reading's FA Cup quarterfinal win over Bradford on Monday, with the Championship club saying a man was arrested in the incident.
The Jamaica international had provided the assist for Hal Robson-Kanu's opener before scoring a deflected second as Reading sealed a 3-0 win to set up a semifinal against holders Arsenal.
But it was in the lead up to half-time that the incident is believed to have occurred as McCleary went to collect the ball for a Reading corner.
He appeared to make a complaint to the assistant referee and Reading confirmed in a short statement that the matter had been passed on to the police.
"An incident was reported to the match officials just before half-time, who in turn told Reading staff. A man was then arrested and ejected during the half-time interval," the statement said.
Royals boss Steve Clarke said after the game he was aware that McCleary was "upset by something" although he had no further information at that time.
It was the Reading fans who had initially been under the spotlight having invaded the pitch at the full-time whistle with a number of lit flares, preventing any on-field celebrations for the players.