Porzingis (hamstring) will not play in Monday's matchup with the Trail Blazers, Marc D'Amico of the Celtics' official site reports.
Porzingis' absence will mark his second straight, as he was a late scratch before Saturday's win over the Suns. The rest of the Celtics' starting lineup is listed as questionable, so depth could be an issue in Portland. In Porzingis' absence, Al Horford, Xavier Tillman and Luke Kornet could see some increased minutes at center.