Geelong forward Jeremy Cameron has entered the AFL's concussion protocols following a head knock during the final term of Friday's match against Port Adelaide.
While Cameron was cleared to continue in the game and did not report any symptoms at the time, further assessment on Saturday has led to Cameron entering concussion protocols.
The club has confirmed Cameron "reported some concussive symptoms" on further testing, with Geelong having since acted to sideline their star forward.
Cameron will enter mandatory 12-day concussion protocols as a result of the testing and subsequent diagnosis.
"As per the AFL's concussion guidelines, Geelong medical staff immediately attended Cameron and conducted a HIA on ground, where he reported no symptoms and satisfied all AFL requirements," a club update read.
"After further review of the video footage, and in consultation with the spotters in the ARC, it was decided there was no criteria to remove Cameron immediately from the field for further assessment.
"As further due diligence, and still with no concussive symptoms, Cameron undertook and completed a normal SCAT6 concussion assessment after the game.
"As is the process following a match, Cameron was monitored and assessed again on Saturday morning, where he reported some concussive symptoms on repeat SCAT6 and a diagnosis of delayed concussion was made."
The result will mean Cameron will miss his side's Round 10 trip to Darwin and could return the week after when Geelong face GWS.