'You don't replace Fred Warner': How will 49ers fill void left by NFL's top linebacker?

'You don't replace Fred Warner': How will 49ers fill void left by NFL's top linebacker?

The 49ers will look to their youth to step up on defense, while the Nov. 4 trade deadline looms.

Will 49ers rookie Nick Martin make his debut against the Falcons on Sunday?

Nick Martin has been a regular on the San Francisco 49ers' weekly inactive list. The rookie linebacker, drafted in the third round, has yet to even suit up for a regular-season game—an unusual situation for such a high draft investment. That may soon change. With star linebacker Fred Warner out for the season due to an ankle injury, the 49ers have promoted Tatum Bethune into the starting lineup. Before Warner's injury, most of Bethune's snaps c…