As Ken Goe pointed out in The Oregonian, a Tuesday practice this week is like a Thursday practice before a Saturday game.
Goe projects that "Wade Keliikipi will start in place of Clark, Dion Jordan in place of Turner and Cliff Harris in place in of Gildon."
While losing three starters is never good, the Ducks are deep on defense and play a lot of guys. All three of the backups are experienced and accomplished.
The Ducks also will be without backup running back Kenjon Barner, who suffered a head injury at Washington State on Oct. 9.
Here's a practice report from the Eugene Register-Guard.