The Buccaneers placed McKnight (hamstring) on injured reserve Tuesday, Scott Smith of the team's official site reports.
Austin was carted off the field at Tuesday's practice with an apparent right knee injury, Jordan Raanan of ESPN.com reports.
Harris is listed as the Giants' co-No. 2 RB along with Tyrone Tracy and Devin Singletary behind Cam Skattebo on the team's unofficial depth chart.
Skattebo is listed as the Giants' starting running back on the team's unofficial depth chart for the preseason finale versus the Jets, Jordan Raanan of ESPN.com reports.
Otton (undisclosed) returned to practice Tuesday, Rick Stroud of the Tampa Bay Times reports.
Wirfs (hamstring) practiced in full-team drills Tuesday, Greg Auman of Fox Sports reports.
Egbuka (toe) isn't participating in Tuesday's practice, Greg Auman of Fox Sports reports.
Johnson (groin) is taking part in Tuesday's practice, Greg Auman of Fox Sports reports.
McMillan (knee) isn't participating in Tuesday's practice, Greg Auman of Fox Sports reports.
Hood (quadriceps) is expected to return to practice this week, Paul Schwartz of New York Post reports.
