After injuring a calf late in practice Thursday afternoon, Buffalo Bills outside linebacker Chris Kelsay has officially been ruled out of Sunday's game against Philadelphia - and will be out even longer, according to multiple reports.

Kelsay is one of five players that have already been ruled out for the game - a list that also includes left tackle Demetrius Bell (shoulder), nose tackle Torell Troup (lower back), inside linebacker Chris White (hamstring) and cornerback Aaron Williams (chest).

On the other hand, the Bills are likely to have two contributing players back and available to play on Sunday, as both right guard Kraig Urbik (knee) and cornerback Terrence McGee (hamstring) both practiced in full all week and are listed as probable. Urbik will likely start at right guard, while McGee's exact role remains to be seen.

Urbik and McGee are joined by five other Bills players listed as probable, including running back C.J. Spiller (knee), wide receiver Ruvell Martin (knee), center Eric Wood (ankle), outside linebacker Shawne Merriman (shoulder) and inside linebacker Nick Barnett (ankle). All seven players listed as probable are likely to play Sunday.