Geelong and former Gold Coast superstar Gary Ablett has suggested he could retire at the end of the year if Geelong wins in the last weekend of September.

The 35-year-old has had a big 2019 playing mainly as a forward, kicking 30 goals and averaging 20 touches from 19 games.

Ablett has only missed one game this year, but through suspension, rather than injury.

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Geelong have had a rough second half of the year, but still sit top of the ladder with two rounds to play.

Speaking to Channel Seven, Ablett said his body is feeling good, but a flag at the end of the year might be a good way to finish his career.

He played in the 2007 and 2009 flags with Geelong before moving to the Suns for seven years but returned to the Cats at the end of 2017.

“Physically I feel pretty good at the moment. But I’ve been in the game 18 years now, so that will be a decision I make at the end of the season,” Ablett said.

“Obviously the goal this year is to win a premiership. It might be a good way to go out, who knows.”

The Cats head to the Gabba to take on Brisbane this weekend, and coach Chris Scott says the battle could be won inside the defensive 50.

"It's a big test. They've won eight in a row playing a really good offensive brand of football," Scott said.

"When they get the momentum they clearly play a style that is hard to stop.

"But at our best we've defended pretty well.

"The game's more complicated than just our defence versus their offence but it's going to be a central part of it."

Scott backed Mark Blicavs, as well as the rest of his defence, to stop the rampaging Lions.

"I'd be surprised if he's not the All Australian key defender along with Harris Andrews who we come up against this week. That's as hard as I advocate for anyone," Scott said.

The Lions will have a couple of ex-Cats in the team, with Allen Christensen and Lincoln McCarthy both making the trip from Kardinia Park to Brisbane.