Barnsley FC are participating in an investigation into an incident involving one of their players during Tuesday night’s pitch invasion at Fratton Park.
Portsmouth fans ran onto the pitch after their team clinched promotion and the League One title with a 3-2 win over the Reds.
Footage appears to show a Barnsley player, thought to be defender Jamie McCart, being struck in the head as supporters rush past him. He is not thought to have been seriously injured.
A club statement said: “We have been asked by the authorities for our observations and cannot make any further comment.”