OT Jason Fox (knee), LB Stephen Tulloch (knee), S Louis Delmas (ankle), CB Chris Greenwood (undisclosed), and DT Sammie Hill (undisclosed) did not participate in Tuesday's minicamp practice. Fox's absence is particularly concerning, since injuries impacted each of his first two seasons with Detroit. Jim Schwartz said Fox will not participate at all during the minicamp as a precautionary measure. “(Fox) has had a good offseason, but his knee was getting a little bit sore so we decided to shut him down,” he said.