An up tempo day of camp was - in part - sullied thanks to some troubling news regarding one of the team's key defensive players.

After missing the entire 2011 season with a torn ACL, Terrell Thomas figured to be the most important piece of the Giants' plan to improve a secondary that was one of the worst in the league in 2011.  Now, Thomas's future is in jeopardy, as the cornerback has left camp and headed to Manhattan's Hospital for Special Surgery [HSS] to have that same knee evaluated.  Word from the Giants is that Thomas has re-injured his ACL, though they did not go as far as to say that it was torn.  According to's Ohm Youngmisuk, he's likely headed for exploratory surgery to determine exactly what the problem is.

Joining Thomas at HSS was linebacker Michael Boley, who has made the trek south to have a hamstring looked over.  Boley is the second line backer to suffer a hamstring injury this camp - acquisition Keith Rivers has been out the past few days - and while any injury is worrisome, Boley's predicament sounded much less precarious than Thomas'.

For those on the field, it was an up tempo day with constant, fluid action sprawling across three fields.  Standing out amongst it all was the play of 2011 first round draft pick Prince Amukamara.  Starting the day with the twos, Amukamara was moved up the depth chart through a combination of his own repeated triumphs, and the struggles of Michael Coe - who was beaten on three consecutive reps by Bear Pascoe, Ramses Barden, and rookie Brandon Collins.  The second year Cornerback nearly capped a terrific day with an interception of Manning.  He was, however, tackled by receiver Dominik Hixon before the ball arrived, prompting the entire defensive coaching staff to throw their proverbial flags.

Manning was eventually picked off by Dante Hughes, planting an exclamation point on a good day from the defense - batting down passes, forcing no-throws, and stuffing runs.  Offensively, second year wide receiver Jerrel Jernigan continued to look impressive - beating Antrel Rolle for a big gain down the middle of the field - and the while first round pick David Wilson was the fifth of five running backs, he again showed great burst when given the ball.

For more on Giant training camp, check each day, listen to Game On With Bruce Jacobs from 3-7, and - for live tweets from camp - follow me on Twitter by checking out the link below.