A man arrested over an incident of alleged racist abuse at Anfield towards Oldham Athletic defender Tom Adeyemi has been bailed for further inquiries.
An investigation was launched after Friday night's Liverpool v Oldham match in the FA Cup third round.
The 20-year-old man, from Aintree, Merseyside, was arrested on suspicion of a racially aggravated public order offence on Saturday.
Adeyemi appeared close to tears during the game, which Liverpool won 5-1.
Club investigation
He appeared to be comforted by team-mates and Liverpool players Dirk Kuyt and Steven Gerrard following the alleged abuse.
There was reported to have been a discussion between police and the game's fourth official after the incident.
Liverpool said they would be investigating the incident.
A statement said: "We take this matter extremely seriously and have provided the police with the evidence we currently have available to us.
"This includes CCTV coverage and still photography of what we believe to be the relevant part of the stadium, statements from matchday stewards in that area and full access to all the footage captured by the cameras filming the match for our in-house TV operation."
Kop section
Gordon Taylor, chief executive of the Professional Footballers Association, said on Sunday that he had discussed the incident with Adeyemi.
"We can confirm that he was the victim of racist abuse towards the end of the Liverpool v Oldham FA Cup tie last Friday evening," Taylor said.
"This abuse came from a spectator sitting in the Kop section of the ground.
"Tom has given a full witness statement to the Merseyside police regarding the incident and will continue to assist the police fully in their enquiries."
The investigation takes place as Liverpool striker Luis Suarez is serving an eight-match ban for racially abusing Manchester United defender Patrice Evra.