A police sergeant making sure people remained orderly while they left a downtown club shortly after 2 a.m. saw the 6-foot-9 Jones walk by a doorway where two homeless men were sleeping and yell "Wake Up!" before lifting his foot and stomping on one man's leg, said Sgt. Pete Simpson, a Portland police spokesman.
Jones, 21, was booked into the Multnomah County Jail on a misdemeanour harassment charge. He was released on his own recognizance and later pleaded not guilty at his arraignment. He did not speak with reporters. His next court date is Sept. 6.
The homeless man, identified as 46-year-old Daniel Kellerher, had a minor injury that did not require immediate medical attention, Simpson said.
Jones graduated from Portland's Jefferson High School before attending the University of Kentucky.
The Rockets selected Jones with the 18th pick of the 2012 draft. He played sparingly in his rookie season, averaging 5.5 points in 19 games.
Rockets spokeswoman Tracey Hughes said the team had no comment, and Jones' agent, Arn Tellem, did not immediately return a phone message left with his secretary Wednesday.