Ospreys, Byrne face charges in 16th player row
Byrne was briefly a 16th Ospreys player on the pitch during his team’s 17-12 Heineken Cup victory over Leicester that secured a quarter-final place.
He had gone off with a bloodied toe, to be replaced by centre Sonny Parker, but Byrne then went back on without any team-mate leaving the field for almost a minute.