Western Bulldogs premiership icon Tom Boyd has urged the club not to be one-dimensional in its pursuit of Port Adelaide superstar Zak Butters.

Boyd's mantra is simple: If the Dogs are to get Butters, they must complement it with a major key defensive signing.

"We're going to need to go out and spend another million bucks to get somebody to play behind the footy for us," Boyd told the Danny/Boyd podcast.

Boyd said if the Dogs were going to "sell the farm" to snare Butters, it would effectively be pointless without phase two of the mission.

"If we didn't go and stretch our salary cap to the enth degree to get a full-back or a centre-half-back I'd be like 'What was the point of all that'.

"It wouldn't make any sense to me.

"I'd rather then go out and spend 105 per cent of the salary cap and go out and get a key position player who is one of the best in the comp ... whatever we have to pay."

Boyd said it would be a "waste of Bont" unless the Dogs simultaneously pulled off a Butters/key defender double deal.

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The 2016 flag hero said stacking a midfield with superstars to an extent that the back six was not overly important had "never worked in the history of the game".

He said the club must go all in and "roll the dice" while the magic of Marcus Bontempelli is still sparkling.

Boyd is a strong believer in keeping Bontempelli in the middle, shooting down pundits who this week suggested a Butters arrival may give the Dogs the luxury of playing Bontempelli off half-back.

"It's the dumbest thing I've ever heard," Boyd said.

"It's not that simple to learn a whole new position and give up on a guy who's been the best midfielder in the comp for seven years.

"It's like, this car works well, let's drive a different one and hope for the best."

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