Pictures of A Port Adelaide supporter has emerged on social media, the latest in a string of incidents involving fans from Adelaide and Port Adelaide including one player being called an "ape".
Club general manager Matthew Richardson told News Corporation the club was appealing for anyone who had information about the man's identity to come forward.
“Port Adelaide is disturbed by the image and does not condone the action of the individual. It is strictly against our supporter code of conduct,” he was quoted as saying.
“If anyone can identify the person please advise the club.”
Earlier this month a woman was charged by police after she labelled Indigenous Adelaide player Eddie Betts an "ape" on social media, after the Crows beat Port Adelaide.
Betts told a local radio show after the incident that racism is wrecking the enjoyment of AFL.
He said "enough is enough" after being subjected to more racial abuse from fans during the showdown with Port Adelaide.
"Stuff like this wrecks it," Betts told Adelaide radio station 5AA on Thursday.
"We want to make footy an enjoyable place and support your team, win or lose.
"There is racial abuse ... it's not kid-friendly. It's just not a great place to be."
Port is also investigating claims their Indigenous ruckman Paddy Ryder was racially abused by a Crows supporter during the match between the South Australian clubs.
AFL chief Gillon McLachlan pledged to do more to combat racism while the Adelaide and Port Adelaide clubs issued a joint message in a bid to end racial vilification.
The AFL Players' Association and various AFL identities also spoke out in support of Betts and Ryder.
"The support that has been shown to me and my family by both footy clubs, the players' association, has been fantastic," Betts said.