Rashad Jennings not spotted practicing Friday

The Giants could be short a key tailback for Sunday’s game at St. Louis. Starter Rashad Jennings (ankle) wasn’t on the field at the outset of practice Friday, per Jordan Raanan of NJ.com. Raanan, who covers the club, said Jennings would not play against St. Louis. The 29-year-old tailback did not practice on Wednesday or…