The Mad Ants waived Thabeet on Thursday.
Thabeet hadn't played a major role with the club this season, though he did average 16.5 minutes in the nine games he appeared in. The 7-foot-3 center will now join the available player pool barring another team claiming him off waivers.
Thabeet didn't play in Tuesday's G League loss to Wisconsin.
Thabeet last played Dec. 10 as he has only appeared in nine games for the Mad Ants this season. The 32-year-old is only averaging 4.0 points and 4.3 rebounds per game this season.
Thabeet finished with two points (0-1 FG, 1-1 FT) and six rebounds over 14 minutes in Tuesday's G League loss to Lakeland.
Thabeet has seen his scoring production decline significantly, and he could only manage two points Tuesday even though several Mad Ants were sidelined with injuries. The 32-year-old is averaging just 4.3 points and 4.3 rebounds per game this season.
Thabeet posted two points (1-2 FG, 0-1 FT), three rebounds, three assists and one block over 21 minutes in Friday's loss to Grand Rapids.
Thabeet has had a minimal impact to begin the season as he has averaged just 19.8 minutes per game. The 32-year-old has 5.2 points and 3.4 rebounds per game over the first five contests.
The Fort Wayne Mad Ants drafted Thabeet 18th overall in the 2019 NBA Draft.
Thabeet played internationally in 2017-18 with the Yokohama B-Corsairs after a number of years in the NBA ranks. He has returned to the US and will aim to make another strong impression with Fort Wayne.
Thabeet is scheduled to appear in five-on-five scrimmages with the Knicks this week and the Bucks the week after, Ian Begley of SportsNet New York reports.
Thabeet's workouts will essentially functions as auditions for a potential training-camp deal. Even if Thabeet does sign with the Knicks, Bucks or another team, the 7-foot-2 center will face an uphill battle to win a roster spot after having not appeared in the NBA since the 2013-14 campaign, when he suited up in 46 games between the Pistons and Thunder. Thabeet was out of basketball entirely in 2018-19, with his most recent competitive action coming in 2017-18 in the Japanese B.League.