Jackson sustained the injured early during Washington's 17–10 loss to Miami on Sunday. While attempting to catch a Kirk Cousins deep ball, Jackson pulled up and limped off the field.
“Any time you lose a guy that runs a 4.25 40, it damages some of your play-action game,” Redskins coach Jay Gruden said after the game. “The first one we threw to [Jackson], he had a step [on the corner] and I believe he would have caught it if he didn't pull his hammy.”
Jackson missed the entire preseason with a separated shoulder. He missed only game last season, his first with Washington.
In 2014, Jackson caught 56 passes for 1,169 yards and six touchdowns. Second-year receiver Ryan Grant is listed behind Jackson on the team's depth chart.
– Rohan Nadkarni