The unofficial face of Collingwood, Jeff ‘Joffa’ Corfe may find himself in hot water after electing to don a North Melbourne cap for the post-match photo with Team Africa following the recent Harmony Cup event.

A cardinal sin in the minds of many hardcore supporters, Joffa’s fashion faux pas may have an impact on his role as Magpies' cheer squad leader.

“Rule number one is you never wear another club’s gear,” one enthusiastic AFL supporter told kangaroos.com.au.

“Even worse, you don’t wear it voluntarily and look happy about it.”

Standing at the back of the team, the easily identifiable Joffa with his peroxide bleached hair holds his clenched fist high for the picture opportunity.

It’s yet to be seen what fall-out, if any will come after Joffa’s potential error of judgement - but he may hear a few of his fellow supporters asking, “What happened to our motto ‘It’s us against them’?”.