According to The Athletic, Porter "began yelling and at one point threw food" before getting "combative" with general manager Koby Altman.
Cleveland tried to trade him over the weekend and will seemingly cut him if there are no offers.
Porter has not yet appeared for the Cavaliers in 2020-21 and was away from the team for personal reasons until returning to the bench Friday, per Chris Fedor of Cleveland.com.
He reportedly returned to practice for the first time Thursday.
"We have a plan in place with KP," head coach J.B. Bickerstaff said. "He's always been a part of the team, but we wanted him with the guys."
Following a single-car accident, Porter was arrested Nov. 15 and charged with improper handling of a firearm in a motor vehicle plus misdemeanor marijuana possession and driving without a license, but all charges were dropped in December.
The 20-year-old showed promise on the court as a rookie after being taken in the first round of the 2019 NBA draft, averaging 10.0 points and 3.2 rebounds per game in 50 appearances.