He missed his first shot, a 3-point attempt.
Mazzulla said Porzingis, who missed the previous two games because of a dislocated tendon in his left ankle, would not have a minutes restriction.
He was cleared to play a limited role in Game 4, but never took off his warmups during Boston's 122-84 loss in Dallas. He had been listed as questionable Monday morning before going through an on-court workout about 2 1/2 hours before tipoff. The workout included shooting, some light-contact post work and lateral movement drills.
The Celtics have said that his tendon issue is unrelated to the calf strain Porzingis sustained April 29 in the first round against Miami that led to him missing 10 games.
Porzingis averaged 13.5 points and 5.0 rebounds in his first six games this postseason, including 20 points, six rebounds and three blocked shots in Game 1 against Dallas.
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