Celtics' Porzingis to Miss Start of Eastern Conference Finals

Kristaps Porzingis sidelined due to calf injury, impacting Celtics' lineup as they await Knicks or Pacers.

Porzingis expected to miss at least the first two games of the Eastern Conference Finals.
The Celtics center has been out since Game 4 of the first-round series against the Miami Heat.
Al Horford and Luke Kornet to see increased playing time in Porzingis' absence.
Porzingis' return is crucial for Celtics' championship aspirations.
The Knicks lead their series against the Pacers and could face the Celtics next.