Lions Gardner-Johnson leaves the field with knee pain

The Detroit Lions’ new defensive back C.J. Gardner-Johnson was carted off the field on Monday’s training camp after grabbing his right knee.

The 25-year-old sustained the injury on day two in a non-contact activity.

If the injury is serious it will be a major setback for Detroit, who were hoping to strengthen their back line and potentially challenge for NFC North this season.

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Detroit signed Gardner-Johnson for an $8 million, one-year deal in March after adding cornerbacks Cameron Sutton and Emmanuel Moseley in free agency.

He had a career-high six interceptions last season with the Philadelphia Eagles after picking off five passes over three years in New Orleans. Gardner-Johnson has reunited with Lions head coach Dan Campbell and defensive coordinator Aaron Glenn after playing for them with the Saints.