Police have released CCTV images of 27 men they suspect were involved in disorder after Sheffield Wednesday's relegation last month.
Rival fans invaded the pitch at Hillsborough after the club's 2-2 draw with Crystal Palace on 2 May. They had to be separated.
Several violent exchanges also took place outside the ground.
Anyone who recognises the men is urged to contact South Yorkshire Police or Crimestoppers anonymously.
The Football Association has started its own inquiry into the crowd trouble at the game.