Chargers head coach Jim Harbaugh remains undecided about who quarterback Justin Herbert’s backup will be when the regular season starts.

After the Chargers lost to the 49ers on Thursday night, Harbaugh said Trey Lance and DJ Uiagalelei are in a close competition to be QB2, and neither one has done enough to separate himself yet.

“I think it’s tight. I don’t have a definitive status on it right now,” Harbaugh said.

Uiagalelei completed seven of 15 passes for 80 yards, with one touchdown. Lance completed 10 of 16 passes for 73 yards, with no touchdowns. Neither quarterback had a turnover. Lance showed off his tremendous athleticism with a 37-yard…

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