Commuters using the Graham Farmer Freeway tunnel will notice a new addition this weekend: a tribute to the late sporting great.

It comes as the Australian Sports Brain Bank starts to see the huge impact of Polly Farmer's diagnosis with a traumatic brain condition.

It's been nearly 20 years since the tunnel on the Graham Farmer Freeway opened and the entrances to the traffic pipeline have eroded.

To fix that, works costing around $1 million are being undertaken to fix it with new aluminium facades featuring silhouettes of the football legend.

The artwork has been crafted at a workshop in Wangara and shows Farmer in action on the field in kicking and marking poses that have become iconic.

"I think this will be a great addition to the tunnel and I think it also, again, just really recognises the massive role and the massive contribution Polly Farmer made to WA,” Transport Minister Rita Saffioti.

The extra tribute to the AFL Hall of Famer comes just a week after the revelation of his diagnosis with the traumatic brain condition, CTE.

The Australian Sports Brain Bank has had the busiest week in its existence since Farmer's condition was announced.