Kyrie Irving's right knee sprain isn't serious and his return to the lineup is expected to be on a day-to-day timetable, a league source tells ESPN's Adrian Wojnarowski.
Irving suffered the injury with about five minutes left in the second quarter on Saturday night against the Clippers. The Clippers outscored the Celtics 75-44 after Irving left, coming back from 28 points down to win 123-112.
Irving missed the end of last season and the playoffs after having surgery on his left knee to remove two screws from his patella that were inserted in 2015 to repair a fracture he suffered during that year's NBA Finals.