The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
Byrne had gone off in the second-half of the Heineken Cup Pool Three clash suffering from a dislocated and bloodied toe and was replaced by centre Sonny Parker, before returning to the field of play without permission.
Byrne, who was suspended by an independent disciplinary panel, will be available for Wales' second Six Nations game with Scotland in Cardiff on 13 February.
The 29-year-old also missed out for Wales during the autumn internationals with a foot injury and had only recently returned to full fitness for the Ospreys.