There is no danger of the Boston Celtics taking their foot off the pedal as the business end of the season approaches, said Sam Hauser after the NBA's best team made it nine straight wins.

Hauser joined Al Horford in scoring 23 points in support of Jayson Tatum (26) as the Celtics improved to 57-14 with a 124-113 road win over the Chicago Bulls at United Center on Saturday.

Tatum returned after missing Thursday's win over the Detroit Pistons to lead a short-handed Boston side to victory, with Jaylen Brown and Kristaps Porzingis absent after picking up minor injuries.

The Bulls led 92-91 in the closing minute of the third quarter only to run out of steam, failing to respond when Payton Pritchard scored six straight points for Boston and Hauser made a 3-pointer to extend their lead early in the fourth.

While the Celtics' focus is now firmly on the playoffs as they target a first NBA championship since 2008, Hauser says they will not ease up in the closing weeks of the regular season.

"We're just hungry for more," Hauser said. "It's not in our character to just mail it in for the rest of the season."

Horford, meanwhile, was most impressed by the way other players stepped up in the absence of Brown and Porzingis, with the Celtics making light of a gruelling run of five games in seven days.

"Different people, different guys, are ready to step up when their number is called," Horford said. 

"We all understand what we're trying to do, how we're trying to play. Guys are just staying ready and taking advantage of the opportunities."

The Celtics face back-to-back away games against the Atlanta Hawks on Sunday and Wednesday as they continue their six-game road stretch.

The 34-37 Bulls, meanwhile, will look to strengthen their grasp on a Play-In spot when they host the Washington Wizards on Monday.