Whitehead was provided an opportunity to play last year when Stephen Tulloch went down three games in. But Tulluch has since recovered, which results in Whitehead competing with Kyle Van Noy for the starting strongside job.
He certainly proved his worth in 2014. Whitehead racked up 12 tackles in his first start a year ago and finished the season with 86 as a full-time starter. But despite statistics that motivated Pro Football Focus to grade him out positively against the run, he felt he needed to put on some weight.
"Watching back last season, sometimes in the run game, I wasn't as sturdy as I could have been," he told MLive.com. "I bulked up a bit to be more stout against the run."
Tulloch, 30, is progressing well in his rehab, the report said, but it's unclear when he'll return. Tulloch had 135 tackles and 3.5 sacks in 2013, his last full season.
Both players were diagnosed with dehydration, but both were able to make it back onto the field before the end of the third quarter. The Lions have a 20-14 lead heading into the fourth quarter.
Pettigrew is being evaluated for a concussion. Whitehead and Carey are dealing with dehydration.
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