A man suffered an arm injury when he was dragged along the road by a minibus which was leaving Steel Park, Corby, on Saturday (November 9).
A brawl involving between 20 and 30 supporters broke out at the game between the Steelmen and Dover Athletic.
Police were called to the ground at about 4.30pm when scuffles broke out at the segregation line following the second Dover goal.
A police spokesman said: “Officers attended and dealt with the incident inside the ground and supervised the dispersal of all supporters at the end of the game.
“We are aware that one man was treated at the scene by first-aiders. He had a cut to the head and no hospital treatment was needed or requested by the club. No serious injuries were reported following the disorder in the ground.
“We are also investigating an assault that happened after the match outside the ground, when a local man, who had approached a minibus leaving Steel Park, was dragged some distance, resulting in an injured arm.”
Police are working with the club to review the incidents at the match which saw the Steelmen’s run in the FA Cup come to an end.