A 59-year-old man from north Wales has been arrested on suspicion of making a racist gesture during Liverpool's FA Cup fourth round tie against Manchester United at Anfield.
Merseyside Police had said earlier on Saturday that they were investigating an incident.
"The man has been taken to a police station and will be questioned by officers," read a statement.
"Merseyside Police would like to thank North Wales Police and Liverpool Football Club for their assistance with this matter."
The game was Patrice Evra's first visit back to Anfield after accusing Luis Suarez of making a racist gesture at him during a match in October. The Liverpool striker is currently serving an eight-match ban by the FA for the incident.