Exeter boss Paul Tisdale hopes the decision not to show Oxford goalkeeper George Long a red card in Saturday's 1-1 draw was not influenced by the lack of appeals from City's bench.
Long escaped further punishment after giving away a fourth-minute penalty.
"There was communication between the technical area and the ref to say the Exeter bench aren't making a fuss about it," Tisdale told BBC Radio Devon.
"But that's got nothing to do with it, you referee to the laws."
The draw lifted Exeter off the bottom of the League Two table, but the Grecians are still without a league win so far this season, having spent most of the summer under a transfer embargo.
|Long time coming|
|Saturday's penalty was the first that Exeter City had been awarded in two seasons.|
Tisdale continued: "It's very difficult from pitch level to see where the ball's gone after the contact - it is a discussion, was that a goal-scoring opportunity?
"I didn't say a word on the bench, it's not for me to say.
"If he thinks it wasn't a red or yellow card then so be it but there should be no influence at all from what I say on the bench.
"I made the point to the fourth official that it shouldn't go against me that I don't make a fuss."