Carlton coach Brett Ratten will seek clarification from AFL umpires' boss Jeff Gieschen about the tactics some taggers are using to curb Blues skipper Chris Judd.

Just a week after being held to 19 possessions by Essendon's Heath Hocking, Judd tallied just 17 disposals opposed to Scott Selwood in West Coast's three-point semi-final win on Saturday night.

The performances marked a rare double finals flop for this year's raging Brownlow Medal favourite, who normally thrives on the big stage.

Ratten denied Judd was carrying an injury, but said he was concerned some taggers weren't even facing the play in their attempt to halt the star on-baller.

"I think probably the attention that he gets ... I'll put something towards (the AFL umpires' department) in regards to players facing the other way at stoppages," Ratten said.

"I spoke to Jeff about it in the last couple of weeks.

"I think there's a bit of greyness ... when players can turn their back on play, or sideways.

"I think it's a bit grey between what's going on on the field and how we coach it as well.

"So we'd like to get some real clarity on that.

"But no he hasn't carried anything.

"Teams have put a fair bit of work into him because he's a great stoppage player and can change a game very quickly.

"He probably didn't have the influence that he could."

Judd has been widely tipped to win his third Brownlow Medal later this month, but teammate Marc Murphy, Sydney's Adam Goodes, Collingwood's Scott Pendlebury and Dane Swan, and Gold Coast's Gary Ablett are also in the frame after stellar seasons.

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