Queensland stewards will determine whether Kathy O'Hara is entitled to a riding fee and a share of any prize money after her sacking from Magic Millions Classic runner Single Gaze.

O'Hara believed she had a firm booking for Single Gaze in Saturday's $2 million race.

But trainer Nick Olive has reportedly booked Damien Oliver for the filly who has a win and a close third from two starts.

Chief steward Alan Reardon said he would speak to Olive on Monday to sort out the situation.

NSW stewards will speak to trainer Gai Waterhouse and apprentice Winona Costin on Monday after a parting of the ways between the pair.

Costin, who is serving a suspension, left the Waterhouse stable last week and is likely to have her indentures transferred to Davis Payne.