The San Francisco 49ers have rounded out their quarterback depth chart by signing former Nebraska and Kansas State passer Adrian Martinez to the practice squad, installing him as the club’s third-string quarterback. In a broader reshuffling of uniform assignments ahead of the season, running back Brian Robinson Jr. has switched to jersey No. 3, while wide receiver Skyy Moore will wear No. 9. Offensive lineman Drew Moss takes No. 65, wide receiver Robbie Chosen No. 7, cornerback Eli Apple No. 30, tight end Brayden Willis No. 83 and wideout Malik Turner No. 84.