Jockey Patrick Valenzuela, who was off his mounts on Saturday and Sunday, will undergo knee surgery and will be sidelined indefinitely, according to his agent, Tom Knust.
Knust said that Valenzuela, 50, injured the knee at Del Mar during the summer, but had been riding through the discomfort in recent months.
“He can’t work horses right now, so he thought it would be the right time to address the issue,” Knust told the Hollywood Park publicity department.