Allen (ribs) has been ruled out for Wednesday's Game 5 in Boston, Spencer Davies of SI.com reports.
The Cavaliers will also be without Jarrett Allen on Monday
Allen (ribs) has been ruled out for Monday's Game 4 against the Celtics, Serena Winters of Bally Sports Cleveland reports.
Donovan Mitchell will miss Monday's Game 4 between the Cleveland Cavaliers and Boston Celtics.
Allen (ribs) was spotted taking part in the Cavaliers' morning shootaround but remains questionable for Monday's Game 4 matchup with the Celtics in the Eastern Conference semifinal round, Carly Mascitti of News 5 Cleveland reports.