The Giants have released the veteran linebacker, according to NJ.com. The New York Daily News also reported the move.
The 31-year-old Pierce played four seasons for the Redskins before spending the next five seasons in New York, serving as a defensive leader as the Giants upset the Patriots in Super Bowl XLII. He suffered a herniated disk in his neck last season, forcing him to miss the team's final seven games.
"I'm doing great, feeling great," Pierce wrote in an e-mail to NJ.com. "Looking forward to endless possibilities. Loved every moment as a NY Giant."