New 49ers running back Brian Robinson Jr. details his early conversations with Kyle Shanahan and his readiness to boost San Francisco's offense.

San Francisco 49ers head coach Kyle Shanahan discussed new running back Brian Robinson Jr. on Sunday, saying the former Washington Commanders ' starting back would be Christian McCaffrey's backup.

Without Robinson, Washington will be working with veteran third-down back Austin Ekeler, special-teamer Jeremy McNichols, third-year ball-carrier Chris Rodriguez and seventh-round draft pick Bill Croskey-Merritt, a Sidney Lanier High School and Alabama State alumnus.