Arnold (shoulder) was placed on injured reserve Monday, Eric Woodyard of ESPN.com reports.

EDGE Analysis

Arnold made his return to action in the team's 34-27 loss to the Packers on Thanksgiving after missing two games while recovering from a concussion. The cornerback recorded four solo tackles in the contest, but he may have suffered a shoulder injury in the process. Arnold missed a pair of contests in October with a shoulder injury, and it's unclear if he aggravated that issue or if he suffered a new injury. The 22-year-old popped up as a non-participant at the team's practice session Monday, and he's now set to undergo shoulder surgery this week, which will sideline him for the rest of the regular season, per Tom Pelissero of NFL Network.

Arnold recorded four solo tackles in Thursday's 31-24 loss the Packers.

EDGE Analysis

The cornerback returned for the first time since Week 10 after working through a concussion and played 17 defensive snaps, while backup Rock Ya-Sin saw nine. D.J. Reed and Amik Robertson led Detroit's cornerback room in snaps for the game, with 54 and 59, respectively. Now that Arnold is back, though, he should continue to play a role, as he has eight pass breakups on the year.

Arnold (concussion) is active for Thursday's Week 13 tilt against the Packers.

EDGE Analysis

Arnold suffered a concussion in Week 10 against Washington and missed Detroit's subsequent two games. The second-year cornerback has since cleared the NFL's concussion protocol and will return to action Thursday. Arnold should return to his starting slot, thus sending Rock Ya-Sin back into a rotational role.

Arnold (concussion) is listed as questionable for Thursday's game against the Packers.

EDGE Analysis

Arnold was estimated as a limited practice participant during the Lions' shortened week while in the league's concussion protocol. He has been sidelined for Detroit's last two games, and he will be allowed to play Thursday only if an independent neurologist clears him from the league's protocol. Rock Ya-Sin would remain as the starting outside cornerback opposite D.J. Reed if Arnold is not cleared to play.

Arnold (concussion) was listed as limited on Monday's estimated practice report.

EDGE Analysis

Arnold has missed back-to-back games after he was concussed in Week 10, and he apparently remains in the league's protocol after logging a trio of DNPs last week ahead of Sunday's game against the Giants. With a quick turnaround ahead of Thursday afternoon's upcoming date with the Packers, Arnold could be in danger of missing a third consecutive contest.

Arnold (concussion) has been ruled out for Sunday's game against the Giants, Dave Birkett of the Detroit Free Press reports.

EDGE Analysis

Arnold was unable to practice all week after suffering a concussion in Week 10, and he'll miss his second straight contest. With Arnold sidelined last Sunday night, Amik Robertson and Rock Ya-Sin handled the vast majority of cornerback snaps for Detroit.

Arnold (concussion) didn't practice Thursday.

EDGE Analysis

Arnold suffered a concussion Week 10 against Washington and didn't play this past Sunday against Philadelphia. He's missed the first two practices this week, so there's reason to be pessimistic about his chance of suiting up Sunday against the Giants. Rock Ya-Sin started at cornerback in Arnold's stead against the Eagles and will likely do so again Week 12 if Arnold remains out.

Arnold (concussion) was listed as a DNP on Wednesday's estimated practice report.

EDGE Analysis

Arnold is in the league's concussion protocol, which prevented him from playing in the Lions' Week 11 loss to the Eagles. A return to practice would indicate that he is progressing through protocol, though he would need to be cleared by an independent neurologist in order to play Sunday against the Giants.

Arnold (concussion) has been ruled out for Sunday's game against the Eagles.

EDGE Analysis

Arnold entered the league's concussion protocol during the Lions' Week 10 win over the Commanders, which caused him to miss all three practices during Week 11 prep. A return to practice would indicate that he's progressing through the league's protocol, though he would have to be cleared by an independent neurologist in order to play against the Giants in Week 12. Rock Ya-Sin will likely start at outside corner Sunday in Arnold's absence, and Nick Whiteside and Avonte Maddox could also work with the Lions' first-team defense if Amik Robertson (hamstring) is also ruled out.

Arnold (concussion) didn't participate in Detroit's practice Wednesday.

EDGE Analysis

Arnold remains in the league's concussion protocol and will need to clear it before he's eligible to return to the field. If the 22-year-old is unable to play in Sunday's matchup versus the Eagles, Rock Ya-Sin could see increased playing time.