Joey Barton has pleaded not guilty to causing Daniel Stendel actual bodily harm.
Barton was charged following an alleged attack on former Barnsley manager Daniel Stendel following a match during last season.
Police were called to the tunnel area of the stadium after Barnsley defeated Barton's Fleetwood Town 4-2 in a League One game on April 13 earlier this year.
Barton, 36, of Widnes, Cheshire, is charged with causing actual bodily harm to Stendel and appeared at Barnsley Magistrates' Court on Wednesday.
The Crown Prosecution Service said Stendel sustained damage to a tooth and required emergency dental treatment that is ongoing. His face allegedly struck a metal pole in the tunnel at Oakwell.
Barton, who denies any involvement, will appear at Sheffield Crown Court on November 6.