Green Bay Packers gather on the field before the NFL Super Bowl XLV football game against the Pittsburgh Steelers on Sunday, Feb. 6, 2011, in Arlington, Texas. (AP Photo/Matt Slocum)

ARLINGTON, Texas - The Green Bay Packers went into halftime at the Super Bowl without cornerbacks Charles Woodson and Sam Shields, while Packers safety Nick Collins went to the locker room early to receive intravenous fluids.

Woodson and Shields both sustained shoulder injuries, leaving the Packers vulnerable on a Pittsburgh Steelers scoring drive that cut Green Bay's lead to 21-10 at the half.

Both teams lost wide receivers to injuries early, as the Steelers' Emmanuel Sanders left the game with a foot injury and the Packers' Donald Driver went to the locker room with an ankle injury.

X-rays were negative on Driver's ankle, but his return remained questionable.

Sanders left with a foot injury after making a 13-yard catch early in the second quarter. He was taken off the field on a cart. Driver's leg buckled on a hard hit by Pittsburgh's James Farrior and James Harrison in the second quarter.

Steelers cornerback Bryant McFadden injured a hip in the first quarter but was able to return.

Offensive tackle Flozell Adams injured his shoulder in the opening quarter when teammate Chris Kemoeatu slammed into his back during Collins' 37-yard interception return for a touchdown that gave Green Bay a 14-0 lead with 3:20 remaining. Adams was replaced by Trai Essex at right tackle for a few plays before returning to start the second quarter.