Chelsea striker Diego has been slapped with an additional one-match ban and a £20,000 fine after admitting a charge of improper conduct.
The fiery Spaniard was punished for his reaction to his sending-off against Everton in an FA Cup tie on March 12.
Initial footage of the action appeared to show Costa biting Gareth Barry following a clash between the two, although the Everton midfielder said afterwards that no contact was made.
Initially banned for two matches, Costa will not sit out three games.
He already missed a 2-2 draw with West Ham on March 19, and will also be suspended for Saturday’s game at Aston Villa and a match against Swansea on April 9.
Costa was sent off in the 84th minute of the Blues’ 2-0 FA Cup quarter-final defeat at Goodison Park. It was, perhaps surprisingly, the first red card of his Chelsea career.
Earlier this season, he was also given a retrospective three-match ban for altercations with Arsenal’s Laurent Koscielny and Gabriel.
Chelsea coach Guus Hiddink, meanwhile, has said he will use the final eight games of the Premier League season to “experiment” with his side, as the Blues are firmly rooted in the mid table.