Kristaps Porzingis is progressing well in his rehab, though there's still no concrete timetable on his return.

Porzingis reportedly is targeting a December return, though his exact timeline remains unclear and the Celtics likely will be cautious with their difference-making 7-footers. Getting him back should provide a big boost to Boston’s rim defense, which has been lacking through the first 13 games.

Coach Joe Mazzulla said Porzingis has been doing some full-court one-on-five work with assistant coaches. Point guard Jrue Holiday worked on defensive drills with Porzingis during Friday’s practice, and it provided a reminder of what Porzingis will provide when he returns.