Essendon assistant coach Dean Wallis will know his fate over a betting charge before the end of this week, AFL chief Andrew Demetriou says.

Late last week, AFL integrity officer Brett Clothier interviewed Wallis over an allegation that the premiership player bet on an AFL game.

"There's still more of that investigation to come," Demetriou said on Tuesday.

"(AFL football operations manager) Adrian Anderson, I'm pretty sure will finalise his decision before the end of the week, given that Essendon are playing this week," Demetriou added.

"To the best of my knowledge, that investigation is still continuing."

If Wallis is found to have breached the AFL's strict gambling regulations, precedents strongly suggest he is facing suspension.

That would prevent him assisting the Bombers in Sunday's elimination final against Carlton at the MCG.

Essendon's 1993 Norm Smith Medallist Michael Long said he had contacted his former team-mate to offer his support.

"He'll no doubt learn from it," Long said on Tuesday after it was announced he'd present the 2011 Norm Smith Medal to the best player in next month's AFL grand final.

"He's a great Essendon man, Dean Wallis. He's one of the loved players, when I was playing and even now the respect that players (have for him).

"No doubt the club is going to support him.

"He knows he has done the wrong thing and he'll accept that."

Clothier is also investigating a pre-match betting plunge regarding the first goalkicker in last week's Gold Coast-Hawthorn game.

Regular Gold Coast defender Nathan Bock was moved forward and kicked the first goal of the match.

His odds had shortened from $101 to $21.

Collingwood premiership defender Heath Shaw has just completed an eight-game suspension after he was caught betting on captain Nick Maxwell to kick the first goal in a match.

Shaw was fined $20,000, while Maxwell was also fined for letting family members know about his rare move forward.

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