Mahogany (knee) has been ruled out for the rest of Sunday's game against the Saints, Tim Twentyman of the Lions' official site reports.
Mahogany went down with a knee injury in the first half. The injury is severe enough for the third-year lineman to be sidelined for the rest of Sunday's game, and he'll undergo more tests to determine whether he'll miss time beyond Week 1. Ben Bartch will fill in at left guard for the time being.