49ers face toughest test yet vs. Chargers; Kyle Shanahan clears up CMC speculation

On "49ers Talk," Matt Maiocco and Jennifer Lee Chan discuss how the 49ers were challenged on both sides of the ball in their joint practice with the Los Angeles Chargers on Tuesday in El Segundo. As Justin Herbert found holes in San Francisco's secondary, Brock Purdy and the 49ers' offense seemed disjointed. On a positive note, coach Kyle Shanahan eased contract concerns about Christian McCaffrey,…