Swansea City boss Vitor Matos says South Korean winger Ji-sung Eom was targeted by racist abuse at Millwall on Tuesday.
Ji-sung Eom has scored two goals in seven Championship appearances this season
Police are investigating a report of racial abuse during Millwall's Championship game against Swansea City on Tuesday.
The match was paused during the second-half while referee Edward Duckworth had lengthy discussions with both sets of coaches.
An announcement was made on the stadium speakers at The Den confirming there had been alleged chants of racism and that police were working to identify any offenders using CCTV.
Swans head coach Vitor Matos later alleged the chants were aimed at South Korea winger Ji-sung Eom.
The Metropolitan Police said in a statement: "Officers swiftly engaged with witnesses to gather statements. No arrests have been made and enquiries remain ongoing."
Eom was among the Swansea substitutes warming up alongside the pitch when the game was brought to a halt during the second half.
Source: BBC Sport