Players placed on the active/PUP list can return to practice once activated. However, if they remain on PUP list to start the regular season, they would miss at least the first six weeks.
Harrison, 27, wound up signing on with the Jets as an undrafted free agent out of William Penn back in 2012. Last year, he was brought back on a one-year restricted tender before testing the open market as an unrestricted free agent in 2016.
The Giants ultimately signed him to a five-year, $46.25 million contract that includes $24 million guaranteed. Harrison will make a base salary of $1.75 million for the 2016 season.
In 2015, Harrison appeared in all 16 games for the Jets and recorded 72 tackles, a half sack, and a forced fumble.