Geelong coach Chris Scott has explained the decision to use tall defender Sam De Koning as the club's leading ruck option on Friday night, with the premiership backman going head-to-head with older brother Tom in the contest.

With ruck pair Rhys Stanley and Toby Conway listed to play in the VFL, Scott named De Koning and Mark Blicavs as his ruck options for the Blues bout, which ended in a 63-point thumping in favour of Carlton.

Tom De Koning was arguably the best player on the field, dominating his younger brother -who was playing out of position - from the offset.

The Blues big man had 15 contested possessions to half-time and ended the night with a game-high 34 hitouts to his brother's 20, with Tom also booting a goal after out-muscling his sibling in a ruck contest before slotting an impressive major.

The decision to use Sam De Koning instead of Blicavs - or Stanley or Conway - in the ruck earned some questions in Scott's post-match media conference, with the Cats coach stating he had decided on the "aggressive move" to get his side, and De Koning, some "spark".

"Sam is probably an example of our need to be a little bit creative," Scott said.

"We're so optimistic about the player he can be. In my mind, he's been one of the really high-level players in the competition. But like us, he's just not there at the moment.

"Getting him up around the ball a bit more might get him a spark that he and we needed. This is an aggressive move, and not one without risk.

MELBOURNE, AUSTRALIA - JUNE 21: Tom De Koning of the Blues and Sam De Koning of the Cats compete for the ball during the 2024 AFL Round 15 match between the Carlton Blues and the Geelong Cats at The Melbourne Cricket Ground on June 21, 2024 in Melbourne, Australia. (Photo by Michael Willson/AFL Photos via Getty Images)

"I think when we look back on [the game], I don't think we'll be thinking it was the fact we didn't have our tall defenders back there (in defence) that cost us the game.

"Sam is a developing player and one we're going to invest in. We will make no apologies for prioritising him."

Scott denied the timing of the selection manoeuvre was "coincidental" given De Koning would be matched up with his brother, who has been one of the form players of the competition over the past month.

The Cats boss admitted he knew Sam would have an uphill battle given his brother's full-time role as a ruckman, but expressed he was "pleased" with some glimpses the defender had in the middle of the ground.

"[The matchup was] coincidental," Scott said.

"I'm not a huge believer in that stuff. I'm not denying there's some good theatre to it. I think what's more relevant is you've got a guy who's a few years older and played a lot more in the ruck. A neutral observer would think [Tom] is better placed to win that position than the guy that hasn't played much in the ruck.

"Again, it's an investment in the future for us and an investment in Sam as well. We need to get him up and going, playing his best footy. We thought [the move] was the best thing to help with that.

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"At his best he's a super key defender. If he becomes one of the really good players in the competition, I don't think it needs to be as a Jacob Weitering-style of player. I think he's going to be a little bit different to that.

"I used to think it was rare having a 204cm key position player, but there's a few of them out there now. One of his strengths is his ground-level stuff.

"We were pleased with some of the signs we saw from him tonight against a really dominant team."

Despite being listed as injured at team selection on Thursday, Stanley has been named to face Port Melbourne in the VFL on Sunday alongside Conway and young tall Shannon Neale.

The trio of talls were joined by mature-aged recruits Shaun Mannagh and Mitch Hardie in coming into the side, with the latter being one of the form players of the VFL but yet to secure an AFL debut.

Alongside Mannagh and Lawson Humphries, Hardie could be rewarded with a call-up as the Cats consider changes to their side, however Scott is wary of striking the right balance between blooding new talent and remaining in the premiership race.

"We've been talking about it. There might be a few things on the horizon," Scott added.

"We're looking to push some players in, but without completely losing our composure around what we can be as well.

Mitch Hardie of the Geelong Cats at training in 2024 (Image via Geelong FC)

"You don't sit back at this stage of the season at 8-6 and think 'oh well, now we're rebuilding'. Haven't done that for 14 years and we're not going to start now."