The French forward (who was grabbed by the face) was initially given a three-match suspension following his red card for slapping Javier Mascherano during Boro's 3-2 defeat at Liverpool.
'Silly Little Men' Upset The Smoggies!
The Smogs appealed on the grounds that the offence did not amount to violent conduct, and it was a reaction to a more serious offence by the Liverpool player.
However, a regulatory commission yesterday rejected the claim as "frivolous" and increased the mandatory three-match ban for the offence to four.
Gibson: "We have amateurs in charge of the professional game.
"We need professional people making decisions, not these silly little men.
"It is ridiculous to call our appeal frivolous and I'm absolutely furious."