Famous Cats fan Catman has swapped his outfit and AFL allegiance for Grand Final week after his side's preliminary finals loss to the Adelaide Crows.

Catman, or Troy West, appeared on The Morning Show on Monday to reveal he's now Tigerman.

Catman revealed he was 'devastated' with the loss one week out from the big game, and couldn't bring himself to watch the match after finding out the result.

The avid Cats fan said his switching of allegiances was to show support to a fellow Victorian team, and to show solidarity against the men from South Australia.

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Catman and Tigerman. Pic: Seven More

West looks the part in Tigers gear, but he'll need to do some work on the Tigers song after struggling to find the words on The Morning Show.

Watch his full interview in the video at the top of the page.

Catman made headlines earlier in the season after passionately responding to a missed kick in his side's qualifying final against the Richmond Tigers.

After seeing his side go 16-4 down into the first break, the passionate fan let out an epic outburst that was caught on camera.