NRL chief operating officer Graham Annesley also refused to rule out banning for life the supporter who threw a mini football that bounced off the head of referee Ben Cummins as he walked off the ground following the Panthers' 26-18 loss to Parramatta on Saturday night.
Despite reports that police had apprehended the culprit and ejected him, Panthers officials yesterday said there was no record of a fan being escorted from the ground.
And they admitted it would be difficult to identify the person who threw the object because there was no CCTV footage of the incident.
It is the second time this season a fan at CUA Stadium has thrown a promotional rubber football at an official or player. One was hurled at Canberra fullback William Zillman as he dived over for a try in round two.