Cleveland Police have confirmed a teenager from Hartlepool was arrested in relation to the incident.
Comments were made on an Instagram Live.
On Friday 24th July 2020, a 15-year-old male from the Hartlepool area was arrested on suspicion of a racially aggravated public order offence in connection with comments made to a Luton Town Football Club player on a social media platform.
The comments are believed to have been made on a live Instagram feed on the evening of Wednesday 22nd July.
The male has been released under investigation whilst enquiries continue.
Anyone who may have any information regarding the comments made on the social media post is asked to contact Sergeant Adrian Dack from the Football Intelligence Unit at Cleveland Police on 101 or Crimestoppers anonymously on 0800 555 111, or online at www.crimestoppers-uk.org.