Green suffered a concussion in Thursday night's preseason loss to the Giants, Kyle Meinke of MLive.com reports.
Green was injured on a block attempt in the second quarter. Prior to leaving, Green had reeled in all three of his targets for 13 yards. A seventh-round pick out of North Carolina last year, Green is trying to win a job behind Amon-Ra St. Brown and Jameson Williams in Detroit's wide-open wideout group.