Fremantle have been caught trying to spy on Western Bulldogs training ahead of their virtual elimination final on Sunday.

The two sides will square off at Marvel Stadium in a blockbuster clash that will guarantee the winner plays finals and likely see the loser miss out.

WATCH THE VIDEO ABOVE: Fremantle caught spying on Western Bulldogs training session.

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And it appears the Dockers were trying to get as much as intel as possible.

About 30 minutes into Friday’s training session at Whitten Oval, Bulldogs coaching staff became aware of two interested onlookers in the stands.

One was Fremantle ruck coach Sam Naismith and the other was head of development Geoff Valentine.

The Bulldogs’ media team was made aware of their presence, while coaching staff moved to remove him from the ground.

Western Bulldogs assistant coach Daniel Pratt left the oval and walked up the stairs to give Naismith his marching orders.

Shortly after, Naismith, coffee in hand, and his companion departed.

Naismith was wearing all black, including a black cap, and was holding a coffee but made no other effort to disguise himself.

“Funny scenes at Whitten Oval - Fremantle staff members booted out of Bulldogs training by assistant coach Daniel Pratt,” 7NEWS reporter Theo Doropoulos tweeted.

“One was former Tigers and Swans ruckman Sam Naismith - so, the least recognisable guy they could send… was Sandilands busy?”

Naismith, who played 33 games for Sydney and Richmond, stands at 206cm so isn’t the most inconspicuous person going around.

It’s not the first time spying has happened in the AFL.

Fremantle previously were caught out for spying on a Port Adelaide training session back in 2015.

Perhaps the best-known example of ‘Spygate’ in sport was when former Leeds manager Marcelo Bielsa was caught spying on rivals Derby County in 2019.

Bielsa later admitted he had spied on all of Leeds’ opponents, famously detailing his tactics in an hour-long PowerPoint presentation to journalists.

This week, Fremantle coach Justin Longmuir insisted the pressure was on the Bulldogs.

Bulldogs coach Luke Beveridge, who spoke before the amusing spy drama, wasn’t buying into it.

“I’m not that interested in the tit-for-tat on that,” he said.

“The equation’s simple.

“Both clubs are in the same situation: you win or you’re out.”

Meanwhile, Bulldogs young gun Jordan Croft had a scare during the training session.

Croft, who made his debut last week, was taken to the rooms with a shoulder concern after an awkward landing.

The 20-year-old father-son then returned to allay any fears of a serious injury.

Beveridge had earlier confirmed Croft’s place in the starting 22.

- with AAP