Porzingis will ramp up his workload, starting with a practice on Monday.

Celtics center Kristaps Porzingis, who has been out all season while he recovers from a leg injury, has reached the “next phase” in his rehab process, according to a statement from the team.

“Celtics forward/center Kristaps Porzingis has reached the next phase in his recovery,” the statement reads. “As part of his rehab plan, Porzingis and Celtics forward Xavier Tillman will be assigned to practice with the Maine Celtics at the Auerbach Center this afternoon.

“Following this practice, they will be recalled to the Boston Celtics, where Porzingis will continue to ramp up his workload.”

Porzingis has not played since the Celtics clinched Game 5 of the NBA Finals last June. He missed most of the playoffs with a calf strain, but returned in time to play in Game 1 of the Finals.

He suffered a torn medial retinaculum allowing dislocation of the posterior tibialis tendon in his left leg during Game 2, and gutted his way through 16 minutes of hobbled action in the series clincher.

Porzingis underwent surgery shortly after the series. Celtics president of basketball operations Brad Stevens told reporters in June that the surgery went great and that the expected recovery period was around five or six months.

He joked that Porzingis might be back to doing his WWE-style entrances at TD Garden by December.

In September, at the team’s media day, Stevens said the Celtics were very pleased, and perhaps a little surprised, with how well Porzingis has progressed after the offseason surgery.

Porzingis said at the time that he was able to run, shoot, and do light contact drills.

Now, the Celtics feel that he is ready for an increased workload as they prepare the 7-foot-2 center for his eventual return.

The Celtics are 11-3 without Porzingis this season. They went 21-4 without him during the regular-season last year, and 10-2 without him during their playoff run that ended with a championship.

When healthy, Porzingis adds a unique inside-out scoring threat to the Celtics offense. He averaged 20.1 points on 51 percent shooting last season. He’s also a career 36-percent shooter from 3-point range. His length and shot-blocking ability changes the way opponents attack the rim against the Celtics.