The Chargers have invested a lot of time this offseason experimenting with Johnson at center. Will it work out?

The Pittsburgh Steelers have running back action to fill this season after Najee Harris left for the Los Angeles Chargers. They know they can count on returner Jaylen Warren. And they hope they can count on rookie Kaleb Johnson from Iowa. But they also added another RB this offseason: Kenneth Gainwell.

ANTIOCH — A Fourth of July fireworks explosion injured Antioch native and NFL running back Najee Harris, multiple sources have confirmed to the Bay Area News Group, but his agent assured fans that Harris would be ready for the upcoming season.