Harrison announced Monday on Instagram.

EDGE Analysis

Harrison requested his release from the Steelers in December and subsequently signed with New England, where he recorded eight tackles in three playoff games. A recent report suggested he would continue his career, but the 39-year-old linebacker apparently hasn't received any offers to his liking. Harrison did retire once before back in 2014, only to change his mind after the first few weeks of the season. A late-blooming undrafted free agent, Harrison has piled up 793 tackles, 84.5 sacks and 34 forced fumbles in 192 regular-season games, displaying rare longevity for a pass rusher. He played with the Bengals in 2013 and the Patriots at the end of last season, but otherwise spent his career in a Steelers uniform.

Harrison hopes to continue his playing career in 2018, Jeremy Fowler of ESPN reports.

EDGE Analysis

Prior to finishing the 2017 season with the Patriots, Harrison requested his release from the Steelers after the team lessened his role in favor of first-round rookie T.J. Watt. This time around, the former NFL Defensive Player of the Year (2008) doesn't intend to sign with any team until after the upcoming draft. Harrison's goal is to find a landing spot that will afford him regular playing time and there reportedly have been a number of suitors who've reached out to him this offseason.

The Patriots signed Harrison to a contract Tuesday, Field Yates of ESPN reports.

EDGE Analysis

The 39-year-old Harrison was released by the Steelers three days earlier after seeing limited use most of the season behind first-round pick T.J. Watt, who claimed a starting role at outside linebacker out of training camp. The owner of 82.5 career sacks, Harrison seems unlikely to be used as anything more than a situational pass rusher in New England, but his addition at least gives the Patriots some extra coverage on the edge with Kyle Van Noy (calf) having missed the team's last three games.

The Steelers opted to release Harrison on Saturday.

EDGE Analysis

Harrison, the Steelers' all-time sack leader, has been with the team since they signed him as an undrafted rookie free agent in 2002. Despite being on the active roster, the 39-year-old has only suited up for six of the team's previous seven games. If this is the end of the road for the veteran linebacker, he will finish his career with 788 tackles (570 solo) and 82.5 sacks,.

Harrison (knee) was not listed on the Steelers' final injury report heading into Monday's game versus the Bengals.

EDGE Analysis

Harrison did not practice Thursday or Friday, but logged a full workload Saturday. It looks like the team was just being cautious with the veteran in order to allow him time to recover before Monday's game. Assuming he avoids any setbacks, look for him to take on his usual role in Week 13.

Harrison (knee) did not participate in practice Thursday.

EDGE Analysis

Harrison continues to miss time with an assortment of injuries, as he has only played in four games this season. Look for more updates on his status to come over the next handful of days.

Harrison is listed as inactive for Sunday's game against the Packers.

EDGE Analysis

Harrison, who had been dealing with a back injury, practiced in full Wednesday, but the veteran linebacker will still end up being a healthy scratch from the Steelers' lineup Sunday. Harrison has only appeared in four games for Pittsburgh this season.

Harrison (back) was a full participant in Wednesday's practice.

EDGE Analysis

Harrison, who's only appeared in four of 10 games this season, has been dealing with injuries on a weekly basis. Fortunately, he seems to be starting this week off on the right foot and looks to be on track to play Sunday night against the Packers.

Harrison (back) is inactive for Thursday's contest against the Titans.

EDGE Analysis

Harrison has only been active for four games this season, playing a total of 29 defensive snaps. The next opportunity for the 39-year-old veteran to return to action will come next Sunday against the Packers.

Harrison (back) is listed as questionable for Thursday's game against the Titans.

EDGE Analysis

Harrison has missed the last two games with this back injury, but even when he's active, he is very limited in his defensive snap count. Therefore, there's no need to rush back the 39-year-old linebackers, so don't be surprised if he spends another game on the sidelines.