KANSAS CITY, Mo. -- Baltimore Ravens coach John Harbaugh said he didn't know the severity of quarterback Lamar Jackson 's hamstring injury, which heightens the concern surrounding his club's worst start in a decade.

Jackson left midway through the third quarter of Sunday's 37-20 loss to the Kansas City Chiefs after being sacked by Chiefs defensive end George Karlaftis and he did not return. The two-time NFL Most Valuable Player sat on the bench for the remainder of the game, flexing his injured right leg occasionally.

"There's nothing that looks like it's season ending by any stretch for anybody," Harbaugh said after watching five starters leave with injuries.

Asked if Jackson could have returned to the game if the score was closer, Harbaugh replied, "I really don't have the a

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