The Lions will be without starting CB Terrion Arnold for Sunday's game against the Indianapolis Colts. Arnold was downgraded by the team's medical staff and ruled out for Week 12. Arnold suffered a groin injury during Thursday's practice.

The Lions won’t have either of the corners that they picked at the top of this year’s draft. The team announced that first-round pick Terrion Arnold has been downgraded to out with a groin injury and did not travel with the team to Indianapolis.

Lions rookie CB Terrion Arnold will not travel with the team to Indianapolis and has been ruled out for Sunday's game against the Colts due to a groin injury.

The Detroit Lions will not have rookie cornerback Terrion Arnold available for their Week 12 contest against the Indianapolis Colts. After suffering a groin injury, the former first round draft pick was officially ruled out of Detroit's road contest.

Lions rookie Terrion Arnold told reporters that he feels like Detroit’s secondary is “the best secondary in the NFL.”

Arnold is still dealing with growing pains in his first season. He has a 52.0 grade on PFF this season, ranking 98th out of 112 cornerbacks. The Lions have seven defenders graded in the top 20 at their position, and eight players on offense were in their respective top 20.

Terrion Arnold was participating in practice on Friday, while fellow rookie Ennis Rakestraw did not participate on Friday. Rakestraw was officially listed on the injury report with a hamstring injury,

The Detroit Lions released their Week 12 injury designations and they’ll be without Ennis Rakestraw against the Colts.