In its place, a welterweight bout pitting surging contenders Tyron Woodley and Andre Galvao has been added.
Rockhold is a 25-year-old product of the San Jose, California American Kickboxing Academy who has made waves with a six-fight win streak since joining Strikeforce. He's 7-1 overall. According to the press release, the extent of his shoulder injury is yet unknown. The bout would have represented a major step up in competition for the young fighter, who was taking on the decorated 40-year-old veteran with a 22-7 career record.
The promotion gave no indication if the fight would be rescheduled in the future.
Meanwhile, the addition of Woodley-Galvao should make for a strong replacement.
Woodley is currently unbeaten, with a 6-0 mark after a recent decision win over Nathan Coy in May. Galvao is 5-1 during his young career, losing only a split decision to Jason High. He's 2-0 in Strikeforce, most recently defeating Jorge Patino via TKO.
The Oct. 9 card will take place in San Jose, California, and feature a welterweight title main event with champion Nick Diaz defending his belt against KJ Noons, along with a co-main event of women's 135-pound champ Sarah Kaufman facing challenger Marloes Coenen.