Mitchell (calf) has been ruled out for Wednesday's Game 5 in Boston, Spencer Davies of SI.com reports.
Mitchell will be joined on the sidelines by Caris LeVert (knee) and Jarrett Allen (ribs), leaving Cleveland quite thin going into a potential elimination game. Expect big minutes for Max Strus, Dean Wade and Sam Merrill, with Darius Garland and Evan Mobley doing the heavy lifting on offense.