Stevenage chairman Phil Wallace has launched an investigation into the attack on defender Scott Laird after Saturday's FA Cup win over Newcastle and has promised to bring the guilty supporter to justice.
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Laird was knocked to the ground following the final whistle as the League Two side celebrated their 3-1 win. The Football Association confirmed that they will look into the incident and Wallace is determined to find the individual responsible.
He said in a statement on the club's official website: "I wasn't aware of the assault on Scott until long after the game. When I was told I spent a considerable time viewing the incident from all angles with representatives of the police.
"The assailant can be seen clearly from the moment he enters the pitch. He has approached at least three Stevenage players, seeming to wait for an opportunity, and thrown a punch to the side of the head that was designed to inflict maximum damage.
"Scotty collapsed unconscious and has no recollection of the incident. This person seemed intent on making a random assault on a Stevenage player after a fantastic victory. This is disgraceful behaviour and we will do everything we can to ensure that the assailant is brought to justice and prosecuted.''
Wallace insists his club did everything they could to prevent the incident, but said he is concerned for the safety of players in the future. The match was shown live on television, which could help identify the attacker, and Wallace will work with the police to find him.
He said: "Recognition should not be difficult as the video images of him are crystal clear. This time it was a fist, who knows what it could be next time? We do everything we can as a club to prevent this type of incident and follow all the recommended procedures.
"But it seems this lad has set out to disguise his intent so that he can cause physical harm to one of our players and we will work with police tirelessly until this person is identified and prosecuted.''