Background: Yi Jianlian (simplified Chinese: Yi Jian Lian ; traditional Chinese: Yi Jian Lian ; pinyin: Yi Jianlian, pronounced [i tcjenljen], EE JEN lee-EN; born October 27, 1987) is a Chinese professional basketball player for the Guangdong Southern Tigers of the Chinese Basketball Association (CBA). He has also played in the National Basketball Association (NBA) for the Milwaukee Bucks, New Jersey Nets, Washington Wizards and Dallas Mavericks. Yi joined the Guangdong Southern Tigers for the 2002-03 CBA season, and subsequently won the CBA Rookie of the Year award. In his first five years with Guangdong, the team won three CBA titles.
Context: Yi was not expected to enter the NBA draft until 2009 because the Chinese Basketball Association ruled that players are not allowed to leave for foreign leagues until they turned 22. In early 2006, however, Yi announced that he would enter the 2006 NBA draft although he eventually decided to withdraw, saying he was "not good enough to compete in the NBA and needed more experience." Later that year, the Guangdong Southern Tigers announced that Yi would enter the 2007 NBA draft.  Yi chose Dan Fegan as his agent to represent him in the NBA draft and flew to Los Angeles to participate in pre-NBA draft camps. Before the draft, Yi was predicted by many to be picked anywhere from third to twelfth. On 28 June 2007, Yi was selected by the Milwaukee Bucks with the sixth overall pick in the 2007 NBA draft, despite Fegan warning the Milwaukee Bucks not to pick Yi and not allowing them to be one of the teams invited to Yi's pre-draft private workouts in Los Angeles. Fegan did not want Milwaukee to select Yi because the city of Milwaukee did not have a large Asian-American community. However, Milwaukee's general manager Larry Harris said they had only drafted the best player available to them. Yi and Sun Yue together marked the first time in NBA draft history where two Chinese born players were selected in the same draft, which was a feat that would not be repeated again until 2016.  After the draft, Milwaukee attempted to convince Yi to sign with the team and on 2 July 2007, the owner of the Bucks franchise, Herb Kohl, wrote a letter to Yi and his representatives, hoping to persuade Yi to sign with the team. Three days later, head coach Larry Krystkowiak and Harris met with Yi, attempting to influence him to play for Milwaukee, however, Yi's representatives requested that the team trade Yi to another team with a city that had a large Chinese presence. Chinese officials also required that any team Yi played for would have to give him sufficient playing time for him to improve for the 2008 Summer Olympics. Kohl made a special trip to Hong Kong to appeal to Yi personally and he assured Chinese officials that Yi would have sufficient playing time. On 29 August 2007, the Milwaukee Bucks and Yi agreed to a standard, multi-year rookie contract.
Question: How did the NBA learn of him?. Whats the answer?
Yi announced that he would enter the 2006 NBA draft