LEXINGTON, Ky. (AP) - Jockey Robby Albarado will miss the Kentucky Derby after breaking his left ankle in a riding accident at Keeneland.

Albarado was scheduled to ride J Boys Echo for trainer Dale Romans in the Derby on May 6.

He got hurt after his horse stumbled at the start of a race Sunday at Keeneland, unseating Albarado on the turf. He was taken to a hospital for X-rays and further evaluation.

Agent Rob Ebanks says Albarado will be sidelined for some time.

Romans tweeted Sunday: "A miracle it wasn't worse. Wishing best to Robby Albarado, his health is 1st."

The trainer says he will discuss replacing Albarado with the horse's ownership.

J Boys Echo won the Gotham Stakes and finished fourth in the Blue Grass, his last start before the Derby.

Copyright 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.