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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 Thursday, and a third straight day without working would, at the very least, leave his Week 16 status in some doubt.

The Giants’ final injury report will be released later today.

The 29-year-old Jennings has been limited to just three carries in the last two games for the Giants (5-9). Rookie Andre Williams will start and get the bulk of the carries against the Rams if Jennings cannot play.