Barnsley will not be appealing the red card shown to Bobby Hassell against Birmingham.
Hassell was sent off after clashing with Blues midfielder Neil Danns in a post-match fracas following The Tykes' 1-0 win.
Barnsley boss Simon Davey had planned to appeal the dismissal, but has decided not to after studying video evidence.
Hassell will serve a three-match ban, meaning he will miss games against Southend, Crystal Palace and Leicester.
The defender will return for the Championship strugglers' final game of the season against West Brom.