Butler was sent off by referee Richard Beeby for allegedly swearing at assistant referee Wendy Toms but lack of video evidence has prevented the club lodging an appeal.
This means Butler must now serve a two-match suspension and he misses the Carling Cup tie against Portsmouth tonight and the league meeting with Wigan on Sunday.
This means Butler must now serve a two-match suspension and he misses the Carling Cup tie against Portsmouth tonight and the league meeting with Wigan on Sunday.