Answer based on context:

The Carolina Panthers earned their fourth straight victory by defeating the Baltimore Ravens at M&T Bank Stadium 23-21. QB Jake Delhomme passed for a career-high 365 yards while WR Steve Smith racked up 189 receiving yards and a touchdown, including a 72-yarder late in the fourth quarter. Also, WR Drew Carter had 4 receptions for 65 yards and a touchdown.  Ravens quarterback Kyle Boller threw two touchdowns to WR Mark Clayton that both came off tips by the Panthers secondary after Ravens starter Steve McNair left the game in the first quarter with a concussion. With the victory, the Panthers improved to 4-2 and second in the NFC South, trailing the 5-1 Saints by one game.

who was injured?
Steve McNair