The Boston Celtics won't have Kristaps Porzingis for Game 3 of the NBA Finals against the Dallas Mavericks on Wednesday because of a rare injury to his left leg.

The Celtics announced Tuesday that Porzingis suffered a torn medial retinaculum allowing dislocation of the posterior tibialis tendon.

The team described the injury as being rare, and said it is unrelated to a right calf strain that side-lined Porzingis for 10 games earlier in the play-offs.

The injury occurred with 3:27 to play in the third quarter of Sunday's 105-98 win over the Mavericks, which gave Boston a 2-0 lead.

Porzingis helped spark the Celtics in Thursday's 107-89 win in Game 1, tallying 11 points and two blocks in the first quarter in his first game since April 29.

He finished with 20 points on 8-of-13 shooting and six rebounds before recording 12 points and four boards in Game 2.

Porzingis spent 2 1/2 seasons with the Mavericks from 2019-22, and with this latest injury, still hasn't played a game in Dallas since being traded to the Washington Wizards in February 2022.