LOS ANGELES — Featherweight champion Chris John’s rematch with Rocky Juarez has been canceled after John fell ill during training.

John (42-0-2, 22 KOs), an Indonesian fighter who beat Juan Manuel Marquez three years ago, was due to fight Juarez at Staples Center on Saturday night as the co-main event with Victor Ortiz’s bout against Marcos Maidana.
Richard Schaefer, the CEO of Golden Boy Promotions, said John collapsed during a sparring session Saturday. John’s handlers believe the fighter has a blood illness, Schaefer said.
John, who has been training in Los Angeles, was hoping to fight in this country for just the second time in his career. John and Juarez fought to a draw Feb. 28 in Houston.