Jockey Michael McNab will miss Vodafone New Zealand Derby day at Ellerslie this afternoon due to a family issue.

McNab, who rode Derby runner-up Mongolianconqueror 12 months ago, had been booked to ride Botti in this year’s running of the $1 million classic. That mount will now be taken by Trudy Thornton.

Ryan Elliot will replace McNab on Duplicity in the Headquarters Viaduct Nathans Memorial and Misha’s Star in the McKee Family Sunline Vase.

Daren Danis will ride Ja Ja Binks in the Waikato Stud Plate, while Opie Bosson will take the ride on Master Painton in today’s final race.