The Celtics insist they know what's wrong with Kristaps Porzingis, but they won't give away any details. 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 has been limited in the East semifinals due to an illness, though there's still a lot unknown about it.

Boston Celtics center Kristaps Porzingis has had a difficult postseason. After averaging 19.5 points in 42 regular season games, the 7-foot-2 Latvian averaged just 12.0 points in Boston's opening round series against the Orlando Magic.