Tillman's absence will not significantly impact the Celtics' rotation or fantasy basketball, as the team's other bigs are available to play. Al Horford, Luke Kornet, and Neemias Questa are all available to supplement Kristaps Porzingis.
Horford had a toe injury earlier this month, but his absence on Sunday is simply for rest reasons. The Celtics don't play again until Thursday, getting their 38-year-old center six days of rest. Jayson Tatum will be back in the lineup, so Horford would likely come off the bench if available.
Tatum is back in the lineup after sitting out Thursday's win over the Pistons. The Celtics will have their preferred starting five on Sunday, with Tatum replacing Al Horford (who has been ruled out for rest reasons).
Horford (undisclosed) will not play in Sunday's game against the Wizards for rest purposes
With Jayson Tatum sidelined for this game, Horford will move back into the starting unit and form a tall frontcourt duo next to Kristaps Porzingis. Of course, Payton Pritchard will continue to play a significant role off the bench.