"[My wife] Jackie and I appreciate the prayers and support we have received from our many friends and fans in the Cardinals community," Brock said in a statement, per Langosch. "We count ourselves blessed that I am receiving the best possible medical treatment, and we look forward to seeing many more Cardinals World Series championships in the future."
Brock's left leg was amputated in November 2015 as a result of a diabetes-related infection. In August of that year, Brock told the Florida Times-Union's Emelia Hitchner he had Type 2 diabetes, and at the time, he traveled the country giving speeches about his diagnosis and offering advice on how best to handle the disease.
Brock spent his first three-and-a-half years in MLB with the Chicago Cubs before the Cardinals traded for him in 1964. He remained with the team until his retirement in 1979. A six-time All-Star, Brock is second in Cardinals history in hits (2,713), 10th in RBI (814) and first in steals (888), per Baseball-Reference.com.
The 77-year-old earned enshrinement into the Baseball Hall of Fame in 1985.