The incident happened during a 1-1 draw with Fulham at Elland Road. Fulham defender Fernando Amorebieta was the victim and was booked for his reaction. He was later sent off for a second bookable offence.
An FA statement read: “Souleymane Doukara will serve an eight-match suspension with immediate effect after he was found to have committed an act of violent conduct.
“The Leeds United forward was charged following an incident which occurred in the 54th minute of the game against Fulham on 23 February, 2016. The breach of FA Rule E3, which the player denied at an Independent Regulatory Commission hearing on Wednesday, was considered a non-standard case given the seriousness and both unusual and violent nature of the misconduct.
“Mr Doukara was also warned as to his future conduct and fined £5,000.”
Leeds have nine games left of the regular season, beginning against Rotherham tomorrow.
Doukara, who has scored five times in 27 appearances this season, will be eligible to return for the final game of the campaign, at Preston, on 7 May.
Leeds said in a statement: “The club is unable to comment on this matter in any further detail until the full written judgement is released. Suffice to say, however, the club is disappointed with the outcome and the length of the ban given to Souleymane Doukara.”