As per the NFLPA's League Cap Report website, the Giants are $41,888 under the salary cap. They placed Corey Webster on I.R. two days ago, and promoted WR Julian Talley to the 53-man roster from their Practice Squad, followed by signing RB Kendall Gaskins to fill the Practice Squad vacancy created by the promotion of Talley. Talley's cap number is $47,647. The Giants' cap number prior to these 3 roster moves was $89,535---also last in the league.
The Giants can't make any other roster moves this week without having to be forced to restructure a player contract in order to stay under the cap. As long as nothing freakish happens in practice injury-wise, and they get out of Detroit game reasonably unscathed, they'll make it through the season without having to tweak a contract in order to make it through the last 2 weeks of the season. They'll be able to I.R. someone next week (just 1) since the prorated cost to sign a player will decrease compared to this week. If Detroit lays a physical beating on the Giants, then things could get ugly.
In a little less than two weeks, the final carryover figures for the 20 non-playoff teams will be in. I'll write up another league-wide team cap report update then in order to reflect those figures. Without further ado, here are the cap numbers for all 32 clubs in the league:
In order of most cap space to least cap space: