Five things to watch for when the Chargers take on the 49ers in preseason action

While McDaniel and his system have been a hot topic throughout training camp, he isn’t the only new coordinator in town.

Thursday’s game will offer a similar peek at what Chris O’Leary’s starting defense has in store.

“Overall, we played together; we played fast; we played violent,” O’Leary said of the group’s performance in Houston. “The result was a good result for us. We see a lot of stuff we can clean up along the way.”

O’Leary’s defense followed up a strong opening game by playing well against the 49ers’ offense in Tuesday’s practice.

“Honestly, don’t think it was our best day,” San Francisco quarterback Brock Purdy said.

The Chargers would like to hear Purdy — who might play Thursday, according to 49ers coach Kyle Shanahan — say that again.