The team announced a long list of inactive players:
The Celtics will finish seventh in the Eastern Conference regardless of the result of the final game, putting them in the play-in tournament starting Tuesday.
Tatum, a two-time All-Star, is averaging 26.4 points, 7.4 rebounds and 4.3 assists per game behind 45.9 percent shooting from the field and 38.6 percent shooting from deep.
He can carry the offense for extended stretches with his ability to hit from deep and attack off the bounce, and he scored 60 points in late April. Boston doesn't have anyone who can come close to replicating his impact if he is sidelined, especially with Brown out for the season.
Fournier, who came over at the trade deadline from Orlando, has also been valuable in recent weeks, scoring at least 15 points in seven straight games.