A massive betting plunge on the Bulldogs has come under investigation by the NRL.

For their Thursday night clash with Penrith, the Bulldogs were drastically backed into short odds before the news was made public that the Panthers would rest several stars in order to keep them fresh for the finals.

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On Monday afternoon, the Bulldogs’ price to beat the Panthers was slashed from as much as $2.30 with bookies into $1.35.

That caused Penrith to drift out to $3.20 after being originally being installed as the $1.60 favourite.

In head to head betting, a move like that in just a matter of hours is almost unprecedented.

Code Sports is reporting that the NRL’s integrity unit is on the case and is having a closer look at the tidal wave of support the Bulldogs received.

With the Panthers now up against it to make the top four following two straight golden point losses, coach Ivan Cleary is reportedly set to rest a string of stars, including son Nathan in readiness for week 1 of the finals which gets underway on September 12.