Former Sale Sharks player Cillian Willis is taking legal action against the club, claiming he was allowed to carry on playing in a match despite having suffered two head injuries.
During the first half of Sale's LV Cup semi-final against Saracens in March 2013 Willis was kicked in the head and then treated on the pitch by medics. The former scrum-half was allowed to play on before picking up a second knock.
With his head heavily bandaged Willis was substituted in the 49th minute. He was assessed by medics for a second time and after some discussion - left the pitch.
Willis hasn't played since and claims he was forced to retire at the age of just 28. He has accused Sale of "clinical negligence" over his career-ending concussion.
A spokesperson for Sale Sharks refused to comment on the issue as it was an ongoing legal process. The Rugby Players Association also declined to comment on whether Willis has contacted them over the issue or not.
This comes on the day that World Rugby announced new technology was used during the rugby sevens in Rio which identifies and assesses head injuries during matches.
The case, most likely to be held in Manchester, is not expected to be heard for at least 18 months.