Skipper to miss Bristol clash.The appeal for Magnus Okuonghae's red card against Charlton Athletic has been turned down.
The U's were informed on Thursday lunchtime that the sending off midway through the first half will stand after the video evidence was analysed.
The full reasoning for the appeal rejection is due to follow soon, but boss Joe Dunne was disappointed that he will be without his captain for the weekend trip to Bristol City.
He said: "I feel bitterly disappointed and let down. I have great respect for the PGMO, but I feel very bitter because we feel we had a case. "We will get a report and explanation, but it will say what it needs to say and the referee has been backed in his decision.
"Despite that, we know what we’re going to do. I've spoken to the players today and started preparation with and without Magnus in the side.