Leading Irish jump jockey Ruby Walsh injured a leg in a fall on Wednesday, leading to several jockey changes for Thursday's program.

Here's a glance at the new rider assignments: 

Race 1 - Invitation Only (4) will be ridden by Paul Townend. David Mullins rides Kemboy (5)

Race 3 - Un De Sceaux (7) will be ridden by Townend.

Race 4 - Barcardys (1) is Patrick Mullins.

Race 6 - Laurina (2) will be ridden by Paul Townend. Robbie Power rides Salsaretta (14).

It is unclear how long Walsh will be sidelined. Thursday, he told the Racing UK TV network that he reopened a fracture from an injury to his right leg sustained last November and that his leg is in a cast. Walsh returned to riding on March 8 and won two Grade 1 races at Cheltenham on Tuesday.