DALLAS -- Chinese basketball officials have a question: Where's Wang?

Free-agent center Wang Zhizhi failed to report to China for mandatory training with his national team, The Dallas Morning News reported in its Thursday editions.

Wang, who was a reserve center for the Dallas Mavericks the last two seasons, also has not contacted the Mavericks since the end of the season, The News reported.

"We have called and gone to Wang Zhizhi's house every day, at least twice a day, to try to locate him," Mavericks owner Mark Cuban told the newspaper. "We have been unable to do so for the past several weeks. We do not know where he is or how to get ahold of him."

The 7-foot-1, 255-pound center has missed two deadlines set by the Chinese Basketball Association for him to return to China, unidentified NBA sources told the newspaper.

That has prompted speculation that he may be thinking of defecting. That could complicate the Houston Rockets' negotiations to make 7-foot-5 Chinese center Yao Ming the NBA's top pick in the coming draft.

Wang's new U.S.-based adviser, Simon Chan, told the newspaper that his client is working out in Los Angeles and preparing for summer league play. However, Chan said Wang still intends to play for the Chinese national team in the World Championship games in Indianapolis Aug. 29-Sept. 8.

Cuban says he's interested in re-signing Wang.