Northampton will not face any sanction over the handling of George North's concussion injury against Leicester.
But, having investigated the incident, the Concussion Management Review Group (CMRG) concluded that North should not have been allowed to return to the match.
The Wales winger was injured during the first half of the Aviva Premiership clash at Welford Road on December 3.
North was apparently knocked unconscious when he hit his head on the ground after being tackled, but he passed a head injury assessment and was allowed to continue playing by Saints' medical staff.
And the CMRG, set up to investigate the incident, have concluded that while there was "sufficient evidence" to end North's involvement in the match, the club did not "intentionally ignore the player's best interests".
North has not been in action since but he has returned to training this week and Northampton are hopeful he will be cleared to play against Sale on Friday.
Instead of opening disciplinary proceedings against Northampton for their handling of North's head injury, the CMRG, set up in partnership by the Rugby Football Union and Premiership Rugby, has made nine recommendations.
The report is the first of its type since the concussion management system was introduced at the start of the season and all 17 pages of it have been published.
The report read: "The CMRG's view is that there was sufficient evidence to conclude not only from the video evidence but also North's history and risk stratification that he should not have returned to the field of play.
"Northampton Saints medical team has accepted that North may have lost consciousness and therefore should not have returned to play.
"The CMRG considered the welfare of North was always at the centre of Northampton's actions, and does not consider that the medical team [or the club] failed to complete the HIA protocol nor intentionally ignored the player's best interests.
"In addition and although not a determining factor, the CMRG is aware that the player appears to have had no residual effects in the short term.
"For the above reasons the CMRG will not be imposing any sanction against the club or any of its individuals as a result of this incident.
"Instead, the Group has made nine clear recommendations in its report.
"In making its recommendations the CMRG is aware that this is the first incident of its kind to be reported in the Aviva Premiership following the introduction of a new concussion management system this season."
A statement from Northampton said: "The club's management remains absolutely confident in the expertise, professionalism and commitment of our medical teams and is encouraged to see that the CMRG has found that the medics had nothing other than player welfare in mind during this incident."
The unfortunate North has suffered a string of high profile head injuries and was forced out of the game for six months in 2015.