Pictures of three man have been released in connection with violence between Preston North End and Blackburn Rovers fans.
Lancashire Police were called to reports of fighting between the two groups after the Championship game at Ewood Park.
The incident around 4.25pm on 9 March took place in the Northgate area.
Fans were dispersed by police and one man was punched and suffered a head injury. He was taken to Royal Blackburn Hospital for treatment.
Seven men were spoken to in connection with the incident.
Police now want to speak to three men, believed to be PNE fans, in connection with the disorder.
PC Dan Fish from Lancashire Police’s football risk management officer, said: “We are appealing for information following serious disorder involving Blackburn Rovers and Preston North Ends fans in March.
“We particularly want to speak to these three men in connection with our enquiries.
“Since the incident took place we have tried to these individuals with the support of fans and both clubs, but as yet have no further information.
“We are now launching a public appeal to identify them. If you know those pictured, please come forward.”
Anyone with information is asked to call police on 101 or email 545@lancashire.pnn.police.uk quoting log 0414 of March 9.
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Alternatively Crimestoppers can be contacted anonymously on 0800555111.