Police have arrested two more people on suspicion of wounding in connection with the assault on Watford FC fan Nic Cruwys.
A 17-year-old boy was arrested on 19 March at an address in Gailey, Staffordshire and an 18-year old man was arrested on 20 March at an address in Ashmore Park, Wolverhampton.
Both were later released on bail while detectives continue their inquiries into the attack, which took place on 7 March on Littles Lane, Wolverhampton, following a game between Wolves and Watford.
The latest arrests bring the number of people detained over the assault – which has left the 44-year-old from Hemel Hempstead in a critical but stable condition – to seven.
Three other 18-year-old men and two teens aged 14 and 13 are also on police bail in connection with the attack, all with strict conditions to report to a police station daily and not to enter Wolverhampton city centre on match days. All seven will be spoken to again by detectives in April.
Detective Inspector Toni Naylor, from Wolverhampton’s Violent Crime Team, said: “We have now made a number of arrests but our investigation is still very much ongoing.
“We remain keen to hear from anyone with information about the assault – who we have not yet spoken to – and I would urge them to contact us as soon as possible.”