49ers' Raheem Mostert believes Jimmy Garoppolo 'will be our starting quarterback' in Week 1 of 2021 season | CBS Sports Headlines 49ers' Raheem Mostert believes Jimmy Garoppolo 'will be our starting quarterback' in Week 1 of 2021 season The veteran running back doesn’t see a rookie starting the season in … Continue reading 49ers' Raheem Mostert believes Jimmy Garoppolo 'will be our starting quarterback' in Week 1 of 2021 season