The Lions placed Pacheco (back) on injured reserve Tuesday.
Pacheco joined Detroit in March on a one-year contract to serve as Jahmyr Gibbs' primary backup. Pacheco initially missed time during training camp due to a sprained MCL before a back injury now will force him to miss at least the first four games of the campaign while on IR. Currently, the Lions roster Sione Vaki, Jacob Saylors and Jabari Small as options to spell Gibbs from Weeks 1-4.