A second man has been arrested over an attack a month ago which left a rugby league fan in a coma.
David Singer, 32, from Halifax, suffered serious head injuries when he was set upon outside Halliwell Jones Stadium in Warrington on 26 September.
He had seen Halifax play Featherstone Rovers in the Championship Grand Final.
A 29-year-old man from Pontefract was arrested in the early hours of Tuesday on suspicion of assault, police said. He was due to be questioned later.
Earlier this month, a 26-year-old man, also from Pontefract, was arrested on suspicion of assault and violent disorder and released on bail pending further inquiries.
Ambulance technician Mr Singer had travelled with his parents and friends to watch the game and was returning to his coach in the car park when he was attacked.
A Cheshire Police spokeswoman said on Tuesday he remained in a coma in hospital in Liverpool, where his condition was described as critical but stable.
Police inquiries have suggested that fans wearing Featherstone colours were targeting Halifax fans as they walked back to the car park after the match.
Officers believe there may be other Halifax supporters who were subjected to abuse or violence before Mr Singer was attacked and have urged them to come forward.