Watch out, Knicks. Kristaps Porzingis is coming.

The former Knicks star, who missed the entire 2018-19 NBA season recovering from a torn ACL and was traded to the Mavericks before the deadline, posted a photo on Instagram Wednesday of him looking jacked while working out as he fills out his 7-foot-3 frame ahead of his long-awaited return.

“When the angle is right 😳😂 shoutout Valdiii we putting in work!!” the 24-year-old Porzingis wrote.

A frayed relationship led the Knicks to dealing Porzingis on Jan. 31, opening up enough cap space for the Knicks to make a run at two max free agents — a futile plan, as it turned out.

Porzingis, the No. 4 pick from the 2015 NBA Draft and a 2017-18 All-Star, signed a five-year, $158 million contract with the Mavs, and he won’t have to wait long to try to show off against his former team.

The Knicks and Mavericks play twice within a week early in the season, Nov. 8 in Dallas and Nov. 14 at the Garden.