Source: Mike Wilkening, NBC Sports Pro Football Talk 
Jacobs – Doubtful and Webster – Out for Sundays game
— New York Giants (@Giants) November 8, 2013 
According to multiple reports, Jacobs was not present at practice on Friday.
Jacobs has been listed on the injury report with a hamstring ailment. However, according to media reports, Jacobs also has a knee injury.