Six arrests were made following crowd trouble in Saturday's Championship match between Birmingham City and Millwall.
A 30-year-old man was arrested on suspicion of assault after a 60-year-old Millwall fan was seriously injured near to St Andrew's stadium shortly before 3pm, when the match kicked off.
The victim, who is believed to have been with his family, was treated at the scene and taken to hospital. West Midlands Police confirmed that five more people were arrested following the match and that "bricks, bottles and objects were used as weapons".
