VIDEO: Tarrant after the siren | Join in the Chorus! | Match highlights | Thomas great snap | Harvey steal and goal | Anthony from long range | Scott press conference | Adams hurts shoulder | Post-match interviews | Matt Campbell interview

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NORTH Melbourne's 54-point win over Melbourne on Saturday had some outstanding moments but equally reinforced several areas of concern, Kangaroos coach Brad Scott says.

Scott was pleased with North's overall performance, saying the win had essentially been built on two "outstanding" five-goals bursts - in the opening 20 minutes of the game and in the first 10 minutes for the third quarter.

"All in all [it was] a good performance, but [there are] still some things that are a little frustrating that we need to continue to work on," Scott said.

The first of Scott's concerns was North's ball movement, particularly its delivery inside the forward 50 once Melbourne decided to move a spare player into defence.  

"At one stage we were getting a hell of a lot of the ball inside 50 but not getting enough reward for that," Scott said.

"So [we have to work on] the method with which we bring the ball in. We've got to have a variety of ways of scoring, not just relying on kicking the ball long to Drew Petrie and hoping he marks."

On that front, Scott said North's three-pronged attack of Petrie, Robbie Tarrant and Lachie Hansen was "really important" to the club's prospects this season.

Although Petrie has again been the clear focal point of North's attack this season - his four goals against the Demons took him to a total of 47 - Scott said Tarrant and Hansen played vital roles.

Scott said North had consciously kicked more often to Tarrant, who kicked four goals on Saturday, against the Demons. And he said Hansen's four-possession tally did not reflect the hard work he had done off the ball.

"The combination is really important. And we're not concerned who kicks the goals, we're not concerned about ... looking at their stats," Scott said.

"We judge them as a unit and as a unit I thought they worked pretty well."

A huge concern for the Roos was the third-quarter left shoulder injury to Leigh Adams, Scott said.

Adams, who has had problems with both shoulders in his 61-game career, ended the game on the bench with his left side strapped.

The injury occurred late in the third quarter and Adams was assisted to the bench by a trainer as the teams went into their huddles.

It was Adams' other shoulder that made headlines two weeks ago when Carlton captain Chris Judd wrenched his arm backwards in the "chicken wing" incident.

But Scott said Saturday's injury was a new one.

"We were obviously never going to put him back on after it happened. The doctors are not sure at this stage [of] the severity but it was bad enough to not even think about putting him back on," Scott said.

"He feels it may have moved a little bit but we won't know until we get the scans and have a look at the severity.

"He's really important to us. Let's hope it's not too serious because it would be devastating for us."

As the race for the eight - and places within it - becomes tighter and tighter, Scott admitted he kept a constant eye on North's percentage.

North's percentage climbed three points to 110.59 after its win over the Demons, which is still behind some of its nearest opponents: sixth-placed Geelong (115.04), seventh-placed Essendon (113.25) and 10th placed St Kilda (117.23).

But despite how critical North's percentage could be to its home and away finish Scott said he would not raise the topic with his players.

"Any time you mention percentage to players it's a bad look I think. The players have got to focus on the process and I'll worry about the outcome," he said.

VIDEO: Tarrant after the siren | Join in the Chorus! | Match highlights | Thomas great snap | Harvey steal and goal | Anthony from long range | Scott press conference | Adams hurts shoulder | Post-match interviews | Matt Campbell interview

Nick Bowen covers North Melbourne news for AFL.com.au. Follow him on Twitter: @AFL_Nick