Lowry fractured his left thumb during the first quarter of Friday night's 122-104 victory. The team said Saturday he will be re-evaluated in two weeks.
Lowry is averaging 21.8 points and 6.5 assists. Ibaka is averaging 14.0 points and 6.5 rebounds.
Lowry went to the bench after he was hurt but returned a few minutes later. He made two 3-pointers in the second quarter before subbing out midway through the period and retreating to the locker room.
He said after the game the injury is unrelated to the surgery he had in July to repair ligaments in the same thumb.
Ibaka was in a walking boot after the game. He was injured when he contested a layup by Brandon Ingram with about a minute remaining in the second quarter. Ibaka lay on the floor, writhing in pain as play continued, before a Toronto foul allowed two teammates to help him limp off the floor.