49ers left guard competition remains unresolved with rookie Willis in mix

The San Francisco 49ers' battle for the starting left guard position is ongoing as rookie Carver Willis replaces veteran Robert Jones in the lineup. Head coach Kyle Shanahan expresses uncertainty about determining a clear starter after weeks of preseason practices. Willis, recovering from a concussion, needs to demonstrate improvement in the coming weeks during games against the Chargers and Raiders. If he doesn't secure the position, the team may reconsider turning to Jones or Connor Colby, who have both struggled. The competition is expected to stretch until the end of preseason, raising questions about the team's offensive line depth going into the regular season.

• 1:00 AMYahoo Sports — Key 49ers position battle may not have a winner, and that's a problem