The San Francisco 49ers' quarterback depth chart behind Brock Purdy remains unclear after the team's preseason loss to the Tennessee Titans, in which Brandon Allen and Josh Dobbs each played one half.

After a tight training camp battle, San Francisco 49ers coach Kyle Shanahan said Wednesday he's still undecided between Josh Dobbs and Brandon Allen as backup quarterback.

San Francisco 49ers head coach Kyle Shanahan explained Saturday his decision to have Brandon Allen as the backup quarterback over Josh Dobbs.