The betting investigation and expected suspension of young Collingwood star Jaidyn Stephenson was the result of Stephenson coming forward to confess his betting to the AFL.

It is understood that Stephenson bet on a Collingwood game, placing a wager of less than $50. The bet was not on the result of the game, nor against the Magpies but involved wagering on possession tallies of at least one other Magpie player.

Stephenson is expected to be stood down by the AFL soon following an integrity unit investigation, and appears certain to miss this weekend's game against the Western Bulldogs. The Age believes Stephenson is facing a lengthy suspension. The second-year player is understood to be distraught.

Collingwood youngster Jaidyn Stephenson. Credit:AAP

While last year's Rising Star winner is facing a suspension and fine, his decision to come forward may mitigate the length of his suspension.