If D.J. Jones’ shoulder injury proves to be serious, Javon Kinlaw is ready to step in for the 49ers on the interior defensive line.

Jones left the field early Thursday, unable to finish practice after getting rolled up on in a pile. General manager John Lynch reported Friday in an interview on KNBR that preliminary evaluations have been inconclusive and more tests have been scheduled.

Kinlaw, who the 49ers drafted with the No. 14 overall pick, could be someone who could fill in if Jones is off the field for an extended time.

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