The Frenchman was sent off by referee Lee Mason at Anfield on Saturday after aiming a slap at Javier Mascherano, who had earlier appeared to make contact with his face in an off-the-ball incident. Boro appealed on the grounds that the offence did not amount to violent conduct.
However, a regulatory commission today rejected the claim as "frivolous" and increased the mandatory three-match ban for the offence to four.
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