Cook has returned no worse for wear from the ACL, and he posted 95 yards from scrimmage (40 rushing, 55 receiving) in Minnesota's Week 1 victory over San Francisco.

The only Packers defender who has any experience against Cook is rookie cornerback Jaire Alexander, whose college team (Louisville) plays in the same Atlantic Coast Conference division as Cook's (Florida State).

"Went up against him sophomore year," Alexander said. "Just gotta hit him low."

Easier said than done against a player with such quick feet. The Packers' open-field tackling in their opener against the Bears was fairly solid, especially on some key third downs in the second half.

There's a good chance Cook will test Green Bay in that regard as he continues to develop into the three-down back the Vikings drafted him to be.

Last year after Cook's injury, Minnesota went to a combination of Latavius Murray as a runner and Jerick McKinnon as a pass catcher out of the backfield. While Murray stepped in for 11 carries last week, it may not be long before Cook takes a larger and larger percentage of the snaps because he's the most complete, and dangerous, of the Vikings' backs.

"Obviously he's a strong runner, runs behind his pads," linebacker Clay Matthews said. "He does a good job in the pass game, too, a lot of screens, scatting out of the backfield.

"He's a guy you need to have your eye on, especially when they try to get him into space. Having him healthy helps their offense out and gives them another playmaker on that side."

San Francisco clamped down on Cook in the second half last week, limiting him to just 10 carries for 18 yards (plus one reception for 8 more) after his strong start. The Packers would love to contain him from the get-go in similar fashion.

But touching the ball 22 times total (16 rushes, six receptions) is a hefty workload for anyone playing his first game since last September. New quarterback or not, it might be just the beginning of where this Vikings offense is headed.