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Wilson Chandler, a veteran N.B.A. forward now signed to the Nets, has been suspended for 25 games without pay for violating the league's antidrug policy by taking “small doses” of a banned substance the league identified as Ipamorelin, a growth hormone.

Chandler, 32, who signed with the Nets as a free agent in July, apologized in a statement on Thursday.

“During my injury rehab process, before I signed with the Nets, I was prescribed a treatment that included small doses of a substance recently added to the NBA’s prohibited substance list,” Chandler said. “I did not realize this substance was banned, and neither did the doctor.”

He added: “I accept responsibility and apologize to my Nets teammates, coaches, front office and fans for this mistake. I will continue to work hard to prepare for the upcoming season.”