Vaki (groin) has been ruled out ahead of Sunday's matchup against the Browns, Eric Woodyard of ESPN.com reports.
The Utah product didn't practice all week after sustaining a groin injury in the Lions' Week 3 win over the Ravens, so it's no surprise that he'll be sidelined Sunday. Vaki played just seven special-teams snaps in that contest, so his absence is unlikely to have much impact on Detroit in Week 4.