San Francisco 49ers star George Kittle sends a warning to the NFL over the return of Robert Saleh as defensive coordinator.

49ers' George Kittle on Robert Saleh Return: 'Violence is Coming' originally appeared on Athlon Sports. Since Robert Saleh left to join the New York Jets, the San Francisco 49ers have struggled to find a consistent defensive play-caller.

After a three year stint with the New York Jets that didn’t go according to anyone’s plans, Robert Saleh is back in San Francisco as the team’s defensive coordinator. It’s tough to blame Saleh for the ways things worked out in New York,