THE Baltimore Ravens are sweating on the fitness of star quarterback Lamar Jackson - after their worst start to a season in a decade.

John Harbaugh's men fell to a dismal 37-20 defeat to the Kansas City Chiefs on Sunday night.

Five injured Ravens were forced out of the game at Arrowhead Stadium.

And play-caller Jackson, 28, was among them, leaving midway through the third quarter.

Jackson was sacked by Chiefs defensive end George Karlaftis and did not return to the game.

He was seen sat on the sideline, flexing an injury in his right leg.

Harbaugh confirmed following the loss that Jackson was dealing with a hamstring strain, per ESPN .

But he refused to be draw on the severity of the injury to the two-time MVP.

"I really don't have the answer to that right now," he admitted.

See Full Page