AFL Footy Show host and Melbourne Demons great Garry Lyon has been stood down from media duties by the Nine Network as he battles a “serious mental health condition”.

Lyon has been subject to reports that he and long-time friend and Footy Show co-presenter Billy Brownless have suffered an irreparable break in their friendship.

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Reports suggest the rift was caused by Lyon’s involvement in a relationship with Brownless’ ex-wife Nikki.

Bill Brownless: renowned for playing the clown. AAP

In the wake of the news.com report, Nine issued a statement asking for Lyon’s privacy to be respected as he battled his health woes.

“For several months The Footy Show and Footy Classified co-host has been suffering from a serious mental health condition and he will take time out from all media roles to recover,” the statement said.

“There is no set time frame as to when he will return to television.”

Lyon was offered the support of Nine management.

“We are all supporting Garry and hope he will be back to good health very soon. Our priority is his wellbeing,” Nine Melbourne managing director Ian Paterson said.

“Garry has our full support. From here on, it’s a private and personal matter and we ask that be respected.”

Lyon played 226 games for the Demons and kicked 426 goals in an illustrious career that saw him named as a half-forward flanker in their Team of the Century.

If you or someone you know is in need of crisis or suicide prevention support, please call Lifeline on 13 11 14 or visit www.lifeline.org.au/gethelp.