Kristaps Porzingis clearly is sick and tired and being ... “probably” are the aftereffects of an upper-respiratory viral illness that sidelined him for nine games in February and March.

NEW YORK — Kristaps Porzingis gave the Celtics what he had in their season-ending Game 6 loss to the Knicks on Friday night. However, his production remained hampered yet again by an illness that has impacted him all offseason.

Going into the Knicks’ second-round playoff series against the Boston Celtics, one of the biggest subplots was how Kristaps Porzingis ... a mysterious illness limited Porzingis to only 13 ...

More NBA news: Celtics Superstar Jayson Tatum Suffers Torn Achilles to End Season But, one of the bigger storylines from this series was the health of star center Kristaps Porzingis. Porzingis was ...

NEW YORK — When the Celtics’ season ended Friday night, Kristaps Porzingis still had not shaken the viral illness that depleted his energy and his talents throughout the Eastern Conference ...

Kristaps Porzingis is dealing with “post-viral syndrome ... time for much of the second half of the season with an unknown illness, and Celtics coach Joe Mazzulla was forced to sit him ...

Boston Celtics star big man Kristaps Porzingis played limited minutes throughout ... He missed eight games in March due to a viral illness. Last week, ESPN NBA insider Shams Charania reported ...