Per Vachianno Twitter and Rotoworld:
Giants DT Marvin Austin (back) "had a little setback," and it's "not clear when he can go."
The injury-prone second-year pro now almost certainly won't be ready for the start of the regular season. The "little setback" figures to intensify the Giants' search for veteran line help. Whenever Austin finally takes the field, it will be his first live non-preseason action since December 26, 2009, when he was still at North Carolina.
I would say his 53 man roster spot COULD be in Jeopardy now