Harrell's injury woes date all the way to high school, where he battled shin splints and had a bad lower back. At Tennessee, Harrell underwent surgery for shin splints on his right leg in 2003 and missed more than half of spring practice that year. That August, Harrell broke a bone in his right ankle and missed the first five games of the season.
Harrell missed two games in 2004 with a right ankle sprain, and then went injury free in 2005. But in Tennessee's second game of the 2006 season, Harrell suffered a torn biceps injury. He tried to play the following week against Florida, and then opted for season-ending surgery.
Harrell didn't take part in any contact drills during Green Bay's post-draft minicamps and organized team activities last year because of that same biceps injury. Then he missed five games during the 2007 regular season with an ankle injury.