Celtics’ Kristaps Porziņģis expected to return for Game 1 of NBA Finals vs. Mavericks: Sources

Boston Celtics center Kristaps Porzingis (8) reacts to a foul call while playing the Miami Heat during the first quarter of Game 4 of the first round of the NBA Playoffs on April 29 at Kaseya Center in Miami, Fla. Porzingis has not played since this game due to a calf strain. (Michael Laughlin/USA TODAY)

Boston Celtics center Kristaps Porziņģis is expected to return to action for Game 1 of the NBA Finals against the Dallas Mavericks, barring a setback, league sources said Tuesday. Porziņģis completed multiple scrimmages in recent days, those sources said.