Defender Scott Thompson admits North's game review meeting following its 55-point loss to Gold Coast was "brutal", but is confident the club can turn things around.

The 29-year-old will notch his 150-game milestone when the Roos take on Geelong at Etihad Stadium this Saturday night in a season-defining game for both clubs.

Thompson said North would have multiple plans in place in the second half of the season to limit the opposition's ability to pick apart its game plan.

"Our best is definitely good enough, it's just a matter of actually playing our best," Thompson told SEN's Morning Glory on Wednesday.

"And, yeah, we had a successful year last year and team's are on to us and our style of game, and they have good ways of trying to spot it.

"So we have to work through that, really play our way and stop hesitating, and if we can play good footy, we can certainly make finals and give it a crack."

Thompson said North failed to bring a high-pressure style of game against the Suns and it had been a major talking point at team meetings this week.

"It [the review meeting] was pretty brutal," he said.

"You should never show a lack of intensity which is very disappointing, so I'm sure we'll rectify that this week and for the rest of the season."

Thompson said the whole playing list was on notice at Wednesday afternoon's main training session ahead of the match against the Cats.

"If people are showing a lack of intensity at training, there will be spots up for grabs and people showing that they can play with intensity will get a game," he said.

Thompson detailed how the role of a key defender had evolved since he first debuted for the club against Essendon in round one, 2008.

The milestone man said the most notable rule change he has had to deal with was the hands-in-the-back interpretation.

"A few of the rule changes are the biggest things I've had to change with the hands-in-the-back, especially being a defender," Thompson said.

"When I started, you could really hold your ground and use your hands to hold your ground but now it's a different story."