West Coast tagger Scott Selwood will attempt to convince himself that Carlton midfielder Chris Judd has a weakness ahead of their expected duel in Saturday night's AFL semi-final at Patersons Stadium.

Selwood, who leads the AFL in tackles this season with an astonishing 190 over 23 games, restricted Judd to just 17 possessions and one goal in West Coast's upset 36-point victory over Carlton at Etihad Stadium in round 14.

But Selwood knows Judd will be champing at the bit to turn the tables when he returns to his former stomping ground this weekend.

Since leaving the Eagles at the end of 2007, Judd has averaged 30 possessions in his five appearances at Patersons Stadium.

Selwood said he was keen to be given the job of manning the former Eagle, who won the AFLPA MVP award earlier this week and is a raging favourite to take out his third Brownlow Medal.

"We've had a couple of battles and he definitely touched me up in the first one," Selwood reflected this week.

"It's just the way he uses his body around stoppages; he's probably the strongest player I've played on.

"So I'll go through his tape and go through my normal routine and try and find any weaknesses.

"He doesn't have any, but you try and make some up in your head that he does have."

West Coast coach John Worsfold said Judd wasn't his only match-up headache in the midfield after watching Marc Murphy tally 37 possessions against Essendon last week.

"Juddy reckons Murphy's the Brownlow favourite, so I think he's arrived (as an elite midfielder)," Worsfold said of Murphy.

"I've been impressed with him over the last few years as to how his football's developed.

"Judd is still a real super player for them, he sets up so much of the play.

"But Murphy's had a massive impact on their performances this year as well.

Selwood said controlling Judd was as much a mental battle as a physical one.

"It is difficult. You have to try and break it up into five-minute (periods)," Selwood said.

"I personally try and break it up into little areas.

"He might win one small area and then you go off on the next little bit, the next five minutes or whatever, (and say) 'I'm going to shut down on him as much as I can'.

"There's different little techniques that happen throughout the game that you try with different players, but with someone like Juddy you always feel as though he's dangerous, so you never want to leave his side too much."

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