Police are investigating an alleged racist comment aimed at Luton striker Carlton Morris, after alerted the fourth official he heard 'something from the crowd' after the Hatters' 3-2 Premier League victory over Sheffield United.
The forward was instrumental in his side's turnaround on Boxing Day, as he played a hand in the two own goals that secured the win after coming off the bench in the 71st minute.
The game at Bramall Lane was refereed by Sam Allison, the first black official to take charge of a top-flight fixture in 15 years and only the second ever.