Juventus forward, Cristiano Ronaldo, is likely to serve a one-game Champions League ban, sources have told ESPN FC.
Ronaldo, who left United for Real Madrid in 2009 in a then world record £80m deal, is desperate to line up against his old club, where supporters still treat him with God-like status.
The panel next meets on 27 September to discuss Ronaldo's fate.
Meanwhile, Valencia coach Marcelino said Ronaldo was "very affected" by his red card and even cried on his Champions League debut with Juventus.
"I haven't seen the play which ended up in the red card".
"It was spotted by the additional assistant, standing behind the goal, who may have thought Ronaldo threw an elbow but that was not the case".
Should UEFA decide to punish the Portugal star, Juve chiefs are expected to lodge an immediate appeal in hope of having Ronaldo available to face United.
"It was a soft sending-off for Ronaldo, but the letter of the law says you probably can not do that, so I think the one-match ban will probably stick".
A one-match ban is guaranteed, meaning he will sit out Juve's game at home to Young Boys on October 2.
UEFA's disciplinary committee will now have a look at the red card incident, and determine whether or not Ronaldo will receive a three-game ban.