Fletcher's iron man streak is in serious jeopardy after veteran linebacker misses second straight practice on Thursday.
With London Fletcher suffering from hamstring and balance issues, veteran Lorenzo Alexander could make his first start since 2010.
The Steelers have been money against rookie quarterbacks since Dick LeBeau returned as defensive coordinator. Can RG3 get different results?
Pierre Garçon, who has missed four of the past six games with a right foot injury, says season-ending surgery is a possibility.