Former St Kilda forward Justin Koschitzke has urged Paddy McCartin to reconsider a return to the AFL as the former No.1 pick eyes a comeback to the league.

McCartin announced his decision to retire from the AFL at the end of the 2019 season following ongoing issues with concussion.

The 24-year-old has been cleared for a return to the league after ongoing tests with AFL concussion experts and is eyeing off a spot on an AFL list for 2021.

Speaking onย SEN Breakfast,ย Koschitzke, who has battled concussion issues following his retirement, warned McCartin of a return.

"It's a tough one as I'm not privy to what is going on with him and the medical side of things and advice he is getting,โ€ Koschitzke told SEN Breakfast.

"Brain injuries can be terrible in later life and I'm experiencing that firsthand. I would really encourage him to make a really intelligent decision and not go on.

"I've got really bad memory loss and bad mood swings and down times. I have no doubt it's from the concussions.

"I certainty feel after the hit in 2006 I changed as a person. I really reckon it affected my personality.

"I have to really watch myself, be careful of what I'm doing and work on myself. No doubt it has had a big impact.

"This is what Paddy should be looking at. He might feel fresh and fine now, but it's the long-term impacts. You look at guys who had some big knocks in their 40s and 50s, I'm certainly concerned about that with the older I get."

List sizes are set to take a hit as an outcome of the coronavirus despite several clubs looking to add to their key forward stocks.