A fan has run onto the field and attacked Jack Grealish from behind.
The statement read: "Following the incident on the pitch involving an attack on an Aston Villa player; a man has been arrested and en route to a custody block".
Former Manchester United and England footballer Gary Neville said Birmingham City would have to take "a huge punishment" for the incident.
Grealish did very well to stay calm and stay away from the situation as the officials led the man off the pitch.
"We deplore the behaviour of the individual who committed this act and rest assured he will be banned from St. Andrew's for life".
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The English Football League (EFL) condemned the incident in a statement posted to its website. "Jack is a Birmingham lad and regardless of club allegiance should not have been subjected to this - there are no excuses".
"The banter between the fans and the singing is all good, there was a fantastic buzz out there, but to have antics like that in the game is absolutely disgusting", said Corkman Hourihane.
"I was just unaware at the time", Grealish told Sky Sports when asked about the attack.
"I just tried to get on with my job".
"Local rivalries are part of the fabric of the game however, as we are sure our friends at Birmingham City would agree, to have a player's personal safety placed under such jeopardy is a serious cause for concern for the entire football community".