Daniel Theis scored 19 points and Marcus Smart added 13 while tying a career high with 11 assists as the Celtics won their second straight.
Lauri Markkanen scored 18 and Thaddeus Young just missed a triple-double with 16 points, nine rebounds and nine assists, but the Bulls dropped their second in a row after three consecutive wins.
Tatum answered a hook shot by Young with a 3-pointer to make it 74-52, and the Celtics withstood a few pushes by Chicago to come away with the win.
Bulls: C Wendell Carter Jr. (bruised right quadriceps) will be evaluated toward the end of the week after he missed his third consecutive game.
Whether the Celtics actually make that trip was up in the air after Monday's game between the Spurs and Pelicans was postponed because the NBA determined neither team would have enough players available.
+2 Jaylen Brown makes two point step back jump shot (Marcus Smart assists) 2-0 11:27
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- Celtics defeat Bulls 119-103 as Jayson Tatum returns from COVID-19 restrictionsBoston.com
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- Celtics roll Bulls 119-103 in Jayson Tatum's return from COVID98.5 The Sports Hub
- Bulls Observations: Starters Stumble, Turnovers Continue in Loss to CelticsNBC Chicago
- Celtics open road stretch with win over BullsBig News Network
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