As a result the Addicks defender will now serve a two game suspension beginning with the FA Cup tie against Nottingham Forest this weekend.
An FA statement reads: "Sankofa will serve a one-match suspension with immediate effect as a result of the dismissal.
"The commission also decided that the claim was frivolous and have given Sankofa an additional one-match suspension.
"He will therefore miss Charlton's next two matches."