7:26 PM - A.J. Klein () announced Tuesday that he was retiring from the NFL, Alaina Getzenberg of ESPN reports.

4:11 PM - A.J. Klein (Buf) (back) has been ruled out ahead of Sunday's game against the Bengals, Alaina Getzenberg of ESPN.com reports.

1:30 PM - A.J. Klein (Buf) suffered a back injury Wednesday and will not practice Thursday, Chris Brown of the Bills' official site reports.

5:26 PM - A.J. Klein (Buf) Bills claimed Klein off waivers from the Bears on Thursday.

5:03 PM - A.J. Klein (Chi) traded Klein along with second and fifth-round draft picks to the Bears in exchange for Roquan Smith on Monday, Josina Anderson of CBS Sports reports.

5:02 PM - A.J. Klein (Bal) Ravens signed Klein off the Giants' practice squad Thursday, Ryan Mink of the team's official site reports.

4:21 PM - A.J. Klein () Bills released Klein on Tuesday.

11:45 AM - A.J. Klein (Buf) returned from the reserve/COVID-19 list Wednesday, Alaina Getzenberg of ESPN.com reports.

12:06 PM - A.J. Klein (Buf) placement on the reserve/COVID-19 list hours before Monday's 14-10 loss to the Patriots was the result of a positive test for the virus, Doug Kyed of Pro Football Focus reports.

5:05 PM - A.J. Klein (Buf) has been placed on the reserve/COVID-19 list ahead of Monday's game against the Patriots, Aaron Wilson of Sportstalk 790 Houston reports.

3:56 PM - A.J. Klein (Buf) recorded five tackles, 2.0 sacks, one pass defensed, a forced fumble and a recovered fumble during Sunday's win over Seattle.

9:49 PM - A.J. Klein (Buf) teammates Matt Milano (hamstring) and Tremaine Edmunds (shoulder) have both been ruled out for Week 2 in Miami.

2:25 PM - A.J. Klein (Buf) Klein is set to start at strong-side linebacker in his first season as a Bill, he may not approach the 71 percent of the defensive snaps he saw for the Saints last season, Mark Gaughan of The Buffalo News reports.

11:16 PM - A.J. Klein (NO) has signed a three-year, $18 million deal with the Bills, Adam Caplan of SiriusXM reports.

5:41 AM - A.J. Klein (NO) recorded 69 tackles (47 solo), 2.5 sacks, one interception and a touchdown in 2019.

9:40 PM - A.J. Klein (NO) recorded six tackles (five solo), one interception and a touchdown in the Saints' 42-10 win over the Panthers on Sunday.

7:41 AM - A.J. Klein (NO) managed three tackles (all solo), two sacks and a tackle for a loss in the Saints' 38-28 win over the Titans on Sunday.

5:50 AM - A.J. Klein (NO) finished with six tackles (one solo) and 0.5 sacks in the Saints' 34-7 win over the Colts on Monday.

11:50 PM - A.J. Klein (NO) (knee) is clear of the injury report for Monday's game against the Colts, Katherine Terrell of The Athletic reports.

5:32 PM - A.J. Klein (NO) (knee) has been ruled out for Sunday's game versus San Francisco, Mike Triplett of ESPN.com reports.

5:09 PM - A.J. Klein (NO) (knee) didn't participate in practice Thursday.

7:12 PM - A.J. Klein (NO) (knee) didn't participate in Wednesday's walkthrough, Katherine Terrell of The Athletic reports.

8:41 PM - A.J. Klein (NO) notched seven tackles (five solo) during Sunday's 26-9 loss to the Falcons.

5:26 PM - A.J. Klein (NO) (undisclosed) is not listed on New Orleans' injury report Thursday, Luke Johnson of USA Today reports.

10:54 AM - A.J. Klein (NO) finished the 2018 regular season with 69 tackles (42 solo), two sacks, two fumble recoveries and an interception in 16 games.

4:34 PM - A.J. Klein (NO) had four tackles (four solo) and a sack in Sunday's 28-14 win over Tampa Bay.

10:47 AM - A.J. Klein (NO) had nine tackles (six solo) in Sunday's win against the Browns.

7:18 AM - A.J. Klein (NO) had two tackles (one solo) in Sunday's loss to the Buccaneers. He played 25 of the Saints' 66 defensive snaps.

8:48 AM - A.J. Klein (NO) is listed as the starting strong side linebacker in the Saints' first unofficial depth chart, reports the New Orleans Times-Picayune.

12:51 PM - A.J. Klein (NO) (groin) was placed on injured reserve Tuesday, Josh Katzenstein of The Times-Picayune reports.

1:49 PM - A.J. Klein (NO) (groin) was ruled out for Sunday's game against the Jets, Nick Underhill of The Baton Rouge Advocate reports.

10:09 AM - A.J. Klein (NO) is expected to miss additional time due to the groin injury he suffered in Thursday's 20-17 loss to the Falcons, Ian Rapoport of NFL Network reports.

5:40 AM - A.J. Klein (NO) had five tackles (three solo) and a sack in Sunday's win against the Panthers.

5:35 AM - A.J. Klein (NO) made eight tackles (five solo) in Sunday's loss to the Rams.

12:50 PM - A.J. Klein (NO) (ankle) is listed as questionable for Sunday's game against the Redskins, JP Finlay of NBC Sports Washington reports.

9:10 AM - A.J. Klein (NO) hurt his ankle against the Bills on Sunday and is questionable to return, Herbie Teope of The New Orleans Times-Picayune reports.

8:29 AM - A.J. Klein (NO) had six tackles (all solo) in Sunday's win against the Packers.

8:32 AM - A.J. Klein (NO) had three tackles (none solo) and a pass defense in Sunday's win against the Lions.

12:51 PM - A.J. Klein (NO) had four tackles and a sack in Sunday's win against the Dolphins.

9:16 AM - A.J. Klein (NO) made six tackles (two solo) in Sunday's win against the Panthers. It was 's first game back in Carolina since signing with the Saints this offseason.

9:44 AM - A.J. Klein (NO) made 11 tackles (eight solo) in Monday night's loss to the Vikings.

7:23 AM - A.J. Klein (NO) made six tackles (four solo) and notched a quarterback hit and a half sack in Sunday's preseason game against the Chargers. According to Mike Triplett of ESPN.com, looks like a lock to start at linebacker for the Saints in Week 1.

11:27 AM - A.J. Klein (NO) was carted off the field with an undisclosed injury Saturday, Josh Katzenstein of The Times Picayune reports.

12:01 PM - A.J. Klein (NO) signed a three-year, $15 million contract with the Saints on Thursday, Mike Triplett of ESPN reports.

8:38 AM - A.J. Klein (Car) is expected to sign with the Saints on Thursday, ESPN reports.

4:00 PM - A.J. Klein (Car) posted seven tackles (four solo) and one sack Sunday against the Chargers.

2:06 PM - A.J. Klein (Car) (concussion) has passed the league's concussion protocol and will start Sunday's game in place of Luke Kuechly (concussion), David Newton of ESPN reports.

8:55 AM - A.J. Klein (Car) (concussion) is considered questionable for Sunday's tilt against the Raiders, David Newton of ESPN.com reports.

11:03 AM - A.J. Klein (Car) (concussion) was a full participant at Wednesday's practice, Bryan Strickland of the Panthers' official site reports.

2:22 PM - A.J. Klein (Car) (concussion) practiced in full Monday, ESPN reports.

2:27 PM - A.J. Klein (Car) (concussion) has been ruled out of Thursday's game against the Saints, The Charlotte Observer reports.

3:36 PM - A.J. Klein (Car) (back) is active Thursday at Denver, Bryan Strickland of the Panthers' official site reports.

11:50 AM - A.J. Klein (Car) is listed as questionable heading into Thursday's season opener versus the Broncos.

11:12 AM - A.J. Klein (Car) (back) was a full participant at Tuesday's practice.

3:17 PM - A.J. Klein (Car) was a limited participant in practice on Monday due to a back injury, David Newton of ESPN reports.

3:18 PM - A.J. Klein (Car) (concussion) is active for Sunday's game against the Eagles and will start in place of Shaq Thompson (knee), Max Henson of the Panthers' official website reports.

1:00 PM - A.J. Klein (Car) (concussion) is listed as probable for Sunday's game against the Eagles.

10:28 AM - A.J. Klein (Car) (concussion) has been ruled out for Sunday's game in Seattle.

11:30 AM - A.J. Klein (Car) (concussion) was again limited in practice Thursday but expects to suit up Sunday at Seattle, Joe Person of the Charlotte Observer reports.

11:59 AM - A.J. Klein (Car) was limited in Wednesday's practice due to a concussion, David Newton of ESPN.com reports.

11:23 AM - A.J. Klein (Car) tied for a team-high 10 tackles (six solo) during Sunday's win over the Saints.

7:13 AM - A.J. Klein (Car) made four tackles (two solo) and intercepted a pass during Sunday's win over the Texans.

3:04 PM - A.J. Klein (Car) recorded six tackles (all solo) during Sunday's season opener against the Jaguars.

2:19 PM - A.J. Klein (Car) second-year LB A.J. Klein is learning all three linebacker spots.

10:16 AM - A.J. Klein (Car) second-year LB A.J. Klein is expected to get a chance to start in 2014.

11:43 AM - A.J. Klein (Car) signed fifth-round LB A.J. Klein to a four-year contract.