New York Giants defensive tackle Shaun Rogers, who had been taking snaps with the first-team defense, has a blood clot in his leg, reports The Star-Ledger's Mike Garafolo on Twitter.
The 33-year-old Rogers, a three-time Pro Bowler, started four games for the Saints last season.
The defensive line for the defending Super Bowl champions is facing multiple injuries. Defensive end Chris Canty, who started every game last season, is still on the physically-unable-to-perform list as he recovers from offseason knee surgery.
The team also announced injury news about three other lineman Tuesday.
Defensive tackle Marvin Austin is dealing with a back issue. Fellow DT Marvin Parker needs surgery for a herniated disc and is out for the year. Defensive end Justin Trattou is out for "several weeks" because of a heel injury.
New York's defensive line has been one of its strengths on its run to two Super Bowls in the past five seasons. The unit's depth now looks weakened.