Wales winger George North has been stood down from playing by Northampton until he has had an independent assessment of the head injury he suffered against Leicester on Saturday.
North, 24, was tackled in the air by Tigers winger Adam Thompstone but passed the pitchside assessment.
Saints reiterated that North did not lose consciousness after the check.
However, they added that they did not have access to full television footage of the incident at the time.
"As at every Premiership match, the Saints' medical team has access to video footage to be used to assist the pitchside assessment of injuries," said a club statement.
"It is important to note this video footage is not always the full range of replay angles available to the TV viewing audience at home.
"If evidence suggesting a loss of consciousness had been available to the medical team at the time of assessment, George would not have been allowed to return to the field of play."
BBC Sport has approached Premiership Rugby for a response regarding Northampton's claim that they did not have a full range of television footage at their disposal.
Meanwhile, the club has not given a timescale on how long the independent review will take to complete.