Alexander (knee) is active for Sunday's game against the Patriots.
With Xavier Rhodes also active for Sunday's tilt against the Patriots, Alexander is expected to serve his usual rotational role.
Alexander is questionable for Sunday's game at New England with a knee injury, Andrew Krammer of the Minneapolis Star Tribune reports.
Alexander was added to the injury report Thursday, though he was still able to practice on a limited basis. With Xavier Rhodes also questionable with a hamstring injury the Vikings could have their secondary depth tested Sunday against Tom Brady.
Alexander recorded four tackles (three solo) and a sack across 38 defensive snaps in Sunday's win over the Lions.
It seemed as if the Vikings were reaching Matthew Stafford every play Sunday, as the team recorded a franchise record 10 sacks during the contest. It was Alexander's third of the season and his season tackle count now stands at 23.
Alexander (ankle) won't play Sunday against the 49ers, Dianna Russini of ESPN reports.
Alexander has been battling this ankle injury since the second preseason game. His absence will open the door for rookie first-round pick Mike Hughes to have a large role as the Vikings' slot corner in the season opener.