Cambridge boss Herve Renard has revealed that defender Stev Angus was left out of the game at Kidderminster because of his reaction in midweek.
Angus exchanged angry words with Renard when he was substituted after picking up an ankle problem against Boston.
"He did not train on Thursday and Friday but he knows my opinion," Renard said after the 1-1 away draw.
"We need to play with spirit and for the shirt. It is easy to play for yourself when things are difficult."