The 24-year-old forward was was found guilty of biting Fulham defender Fernando Amorebieta in their 1-1 draw on February 23.
Amorebieta was booked for his reaction to the bite.
The FA said in a statement that the incident "was considered a non-standard case given the seriousness and both unusual and violent nature of the misconduct".
The French-born Senegalese player will be eligible to return for Leeds' final game of their Championship campaign at Preston on May 7.
The FA have handed out a number of bans for biting in recent seasons and famously suspended Barcelona striker Luis Suarez for 10 matches for the offence when he was playing for Liverpool.
Suarez was also banned for seven games when playing for Ajax Amsterdam and kicked out of the 2014 World Cup for sinking his teeth into Italy defender Giorgio Chiellini.
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