McCaffrey, a San Francisco star running back who played at Valor Christian High School and is the son of former Denver star receiver Ed McCaffrey, went against the Broncos in a joint practice at the 49ers’ practice facility. “That’s a good D-line, a really good D-line and a good defense,’’ McCaffrey said afterward.

After the Broncos’ frontmen pillaged San Francisco, Castle Rock native and 49er Christian McCaffrey confirmed what Denver’s offense has known for a few months.

The 49ers saw top draft pick Mykel Williams exit with a hyperextended knee in their spirited joint practice with the Denver Broncos.

San Francisco 49ers rookie defensive lineman Mykel Williams likely suffered a knee hyperextension in Thursday's practice with the Denver Broncos.

Another unfortunate victim of the camp injury bug is former Georgia Bulldog and current San Francisco 49er, Mykel Williams. According to a report from NBC Sports, during a joint practice with the Denver Broncos,