Bills running backs Fred Jackson and C.J. Spiller are both questionable for Sunday's game against New England. Jackson has missed the last two games with a sprained knee he suffered in the season opener against the Jets, while Spiller is battling a shoulder injury he sustained last week against Cleveland. Both were limited in practice on Friday. Cornerback Leodis McKelvin, who also returns punts, is listed as probable for Sunday's game. He missed Wednesday's practice with a mild groin strain, but was a full participant in Friday's session. Source: Sports Network