When contacted by The Age, Frost's manager Anthony McConville said he was yet to receive a formal contract offer from Melbourne, but he was confident the two parties were having positive discussions.

"He's been told he's a required player at Melbourne," McConville said.

Frost was on Greater Western Sydney's original list, playing three games in their first AFL season in 2012.

He only played 18 more for the club before moving to the Demons at the end of 2014.

Listed as 194 centimetres tall, Frost is a bold, athletic defender who often leaves fans with hearts in mouths with his ball use.

But he has been far more reliable this year and was even labelled by St Kilda champion Nick Riewoldt as Melbourne's best-performed defender.

"I think they're paying massive money to [Jake] Lever and [Steven] May, but Frost is their best defender," Riewoldt said on SEN.

"I'm more confident in Frost at the moment than the other two to beat a man.

"If I was playing tomorrow and the three of them lined up, I reckon I'd find it harder to get a kick on Frost than the other two.