Mitchell (hamstring) will remain sidelined for Sunday's game in Tampa Bay, Jenna Laine of ESPN.com reports.
Mitchell's absence will mark his second straight due to a hamstring injury. Star rookie Sam LaPorta (calf) has been deemed questionable, which leaves Brock Wright and Darrell Daniels as the Lions' only current healthy options at tight end. Mitchell now will focus on a potential Week 7 return at Baltimore.