The Baltimore Ravens ' season hangs in the balance if quarterback Lamar Jackson is out for an extended period of time with an injury . CBS color commentator Tony Romo expressed worry following Baltimore's 37-20 loss Sunday to the Chiefs . Jackson left the game midway through the third quarter and did not return after George Karlaftis sacked him.

Baltimore is 1-3 for only the third time in franchise history. On each of the previous occasions, the Ravens failed to reach the playoffs.

"If Lamar Jackson does have a hamstring, which is what we reported [Sunday] on why he ended up not being able to finish the game, that makes me extremely concerned because I don't know if this team defensively can just will them to victories," Romo said on CBS Sports HQ . "The Chiefs have done

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