The Queensland Racing Integrity Commission has opened an investigation into videos posted online allegedly showing two jockeys in the presence of white powder.

Amy Graham and Casey Waddell have been stood down from riding duties after the two short videos surfaced on social media.

A five-second video allegedly shows Graham, 28, leaning over a kitchen bench and snorting something off a plate.

A separate video allegedly shows Waddell dipping her finger into a small container and then rubbing it into her mouth.

There is no indication when or where the videos were filmed.

"I know the two people who were with me at the time and I was unaware I was being videoed," Waddell told News Corp on Monday.

"The video taken of me was done in a private setting. I had no idea I was being recorded."

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