Mathis announced his retirement from the NFL, Tori Petry of the Lions' official website reports.

EDGE Analysis

Selected by the Jaguars in the second round of the 2003 NFL Draft, Mathis was quietly one of the league's better cornerbacks for a sizable portion of his career. He never quite reached superstar status, but he did start 129 games for the Jaguars from 2003 to 2012, then made another 36 starts for the Lions over the past three seasons. After a concussion brought his 2015 campaign to an early finish, the 35-year-old Mathis said he's ready to hang up his cleats. The Lions, meanwhile, have an emerging star at cornerback in Darius Slay, but they could undoubtedly still use some help at the position.

Mathis (concussion) was placed on injured reserve Saturday, Dave Birkett of the Detroit Free Press reports.

EDGE Analysis

Mathis missed the previous three games due to concussion symptoms, so it's not too surprising to see him land on IR. The 35-year-old could found his way onto the field next year, but given his age and injury history it wouldn't be surprising to see him retire at the end of the season.

Mathis (concussion) has been ruled out for Sunday's game in Green Bay, Dave Birkett of the Detroit Free Press reports.

EDGE Analysis

This isn't much of a loss for the Lions, as Mathis hasn't been playing at the same level he did last season. Nevin Lawson will likely get another start across from Darius Slay.

Mathis (illness) is inactive for Sunday's game against the Chiefs.

EDGE Analysis

As a result, Nevin Lawson will start at cornerback for the Lions on Sunday in place of Mathis.

Mathis has signed a two-year deal with the Lions worth $3.5 million, mlive.com reports. Mathis, who turns 35 in August, will return to the Lions following a 2014 campaign in which he notched 51 tackles and a pick. In his third season with the team, look for Mathis to reprise his starting cornerback role opposite Darius Slay.

Lions CB Rashean Mathis is the favorite to start a cornerback following the release of free agent CB Chris Houston. Mathis had a renaissance in 2013, starting 13 games for Detroit and grading out as 27th best cornerback in the league according to Pro Football Focus. It is hard not to predict some regression as Mathis enters his age-34 season, but for now he looks safe atop the Lions' depth chart.

Lions agreed to terms with CB Rashean Mathis on a one-year contract.

Lions CB Rashean Mathis exited Sunday's Week 6 game against the Browns with a groin injury. Mathis suffered the injury in the second quarter and is questionable to return. Rookie Darius Slay has replaced him in the starting lineup.

Lions coach Jim Schwartz is now denying RCB Rashean Mathis suffered a Week 4 concussion. The Lions seem to care about concussion disclosure less than any team in the league. Mathis suffered the first-half head injury Sunday against the Bears, and was ruled out at halftime. On Monday, Schwartz insisted Mathis is "not having any symptoms. Sometimes you see some delayed stuff. ... None of that's been the case with Rashean." It appears Mathis will be cleared to play in Week 5.

Lions CB Rashean Mathis was forced from Sunday's game against the Bears with a concussion, and will not return. Mathis went down in the first half, and was ruled out after halftime. Shaky rookie Darius Slay is now in the game for the Lions.