Adelaide and North Melbourne have confirmed the receipt of letters threatening stars Andrew McLeod and Nathan Thompson earlier this year.

McLeod, Thompson and Sydney Swans ace Adam Goodes are among the five AFL players believed to have been targeted by the threats, which were sent out in the lead-up to the Victoria-Dream Team Hall of Fame tribute match in May.

"The Adelaide Football Club can confirm that one of its players was the subject of a threatening letter sent to the club earlier this season," the Crows said in a statement.

"The letter was forwarded to Crows chief executive officer Steven Trigg in May this year and passed on to police."

"Police investigations are continuing and at this stage there will be no further comment."

A North Melbourne statement said Thompson's threat had also been forwarded to police.

"The North Melbourne Football Club can confirm that Nathan Thompson received a threatening letter earlier this season," it read.

"The letter was forwarded to North Melbourne chief executive Eugene Arocca, who passed it on to police.

"The club can make no further comment on the issue as it is subject to an ongoing investigation by Victoria Police.

"Please respect the privacy of Nathan and his family as this sensitive issue is resolved."

Players from Carlton and Essendon were also thought to have received letters.

The Victorian police response to the threats included arranging additional security for McLeod and Goodes during their time in Melbourne with the AFL Dream Team.

"We have got the Moonee Valley Criminal Investigations Unit detectives investigating a number of threatening letters allegedly sent to AFL players," spokesman Sen-Constable Adam West told News Ltd.

"Victoria Police takes any threats made to any person extremely seriously and is investigating these matters."

The Swans, meanwhile, have declined to make any comment about the matter.

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