The red card was given to Thompson for violent conduct and O'Neill will be swift to act if he regards the sending off as warranted:
"I will have a look at the tape of the incident and take action accordingly."
"I didn't really see it, but you would think that he would have learned from watching the John Hartson incident on Monday night. "
"It was very disappointing because it seemed to be a bit of a nothing incident. It really spoiled what had been a very good performance from him."
As a result of the red card Thompson will sit out next Sunday's Old Firm game.