Those who returned to the locker room are running back Andre Brown, tight end Christian Hopkins, defensive end Justin Trattou, linebacker Adrian Tracy, quarterback Ryan Perrilloux and defensive tackle Dwayne Hendricks.
Brown (fourth round, 2009) and Tracy (sixth round, 2010) are former Giants draft choices.
Brown, who had two carries last season for the Denver Broncos, is the only one of the six that has appeared in a regular season NFL game. He rushed for 106 yards on 33 carries in the just-concluded preseason.
Hendricks was on the Giants' practice squad from Oct. 20, 2009 through the end of that season.
Perrilloux, a first-year pro, completed eight of 13 passes for 89 yards in the preseason.
Hopkins, who was signed on July 30, played two seasons in the United Football League.
Trattou is a rookie free agent from Florida.
NFL teams can have up to eight players on their practice squads, so the Giants can sign two additional players.