Namibia coach Dave Waterston has asked World Cup officials to cite Ireland lock Paul O'Connell for stamping on Archie Graham.
O'Connell was penalised for the incident but Waterston said he had referred the match to the disciplinary panel for further investigation.
Under tournament rules, teams cannot cite opposing players but can refer incidents to citing officers who then decide whether a player has a case to answer.
"We don't normally cite players when we lose but we regard this incident as of such a magnitude that we had no alternative," Waterston told a news conference.
O'Connell indicated to referee Andrew Cole that he had not he not seen Graham on the ground when he trampled on him.
However, that view was rejected by Waterstone.
"I don't understand how he can say that because he went back and stepped on him a second time," he said.
If O'Connell is adjudged to have a case to answer and found guilty of the offence he could face a ban of 12 weeks, immediately ending his involvement in the tournament.
Coach Eddie O'Sullivan said the Irish camp had still not been formally informed of any citing, but confirmed he would be mounting a vigorous defence of the second-row.
"I am a bit surprised," he said. "Both the referee and touchjudge saw it and decided it was worth a penalty only. If Paul had received a yellow card it might have been different.
"I don't understand how the Namibians think Paul could have seen where he was putting his feet.
"He had his back to the play and was being driven forward. I was pretty worried he was going to fall over the lad, which could have been quite nasty."
So far, only Fijian winger Rupeni Caucaunibuca has fallen foul of the independent disciplinary commission after receiving a two-match suspension for punching France back-row Olivier Magne.
The IRB have 48 hours to decide whether they will call O'Connell for a hearing, which would be held in Sydney.
If they do decide to press ahead with action, any ban over four weeks would effectively rule the Munster lock out of the rest of the tournament.