X-rays on the ankle of Los Angeles Chargers quarterback Justin Herbert came back negative after the game, NFL Network reported Monday.

Herbert will continue to be monitored this week, per the report.

He hobbled off the field in the third quarter of Sunday’s 20-10 road loss to the Pittsburgh Steelers due to soreness from a previous ankle injury and was seen in a walking boot after the game.

Herbert, who never returned to the game, acknowledged afterward that he felt soreness increasing throughout the game from the earlier injury, a high ankle sprain, that put him in question entering the contest.

Taylor Heinicke took over under center for the Chargers, completing 2 of 2 passes for 24 yards, but Los Angeles was shut out the rest of the way.

Prior to exiting, Herbert completed 12 of 18 passes for 125 yards and a touchdown. He has thrown for 399 yards with four TDs and one interception through three starts.

Herbert, 26, missed two practices and was limited in another last week due to a high ankle sprain.

The Chargers (2-1) host the Kansas City Chiefs (3-0) next Sunday.