BOSTON — Kristaps Porzingis unexpectedly left the Celtics’ Game 1 loss to the Knicks in the first half due to illness on Monday night. The Celtics were back together on Tuesday at the Auerbach Center watching film before a pivotal Game 2 matchup.

Boston Celtics center Kristaps Porzingis has been dealing with an illness that knocked him out of the lineup in March and has forced him to miss time here and there ever since.

Kristaps Porzingis played just 13 minutes, all of which came in the first half. That meant that 38-year-old Al Horford had to play 34 minutes in the overtime loss, which included much of the second half when New York erased the large deficit to force an extra period.