SANTA CLARA, Calif. — Few teams have the star power of the San Francisco 49ers, who feature several of the top players in the game, including Trent Williams, Nick Bosa, Fred Warner and Christian McCaffrey.

San Francisco's hopes for a major turnaround following an injury-plagued six-win season might depend on a bunch of untested players on the defensive line.

The Niners used three of their top five picks on defensive linemen and will need major contributions from those rookies if they want to get back to the postseason. The early results show signs of promise, but the 49ers know that counting on rookies to make an immediate impact can be a dicey proposition.

“We may not know who they are until the midway point of the season. They’re rookies,” defensive coordinator Robert Saleh said. “As

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