Goldman banker in new Galleon probe US prosecutors in California are investigating a Goldman Sachs banker for allegedly sharing confidential information about pharmaceutical mergers with an employee of Galleon, the hedge fund run by Raj Rajaratnam, according to a person familiar with the matter. Investigators are looking into whether the banker, Matthew Korenberg, shared information about takeovers with Paul Yook, a former Galleon portfolio manager, people involved in the case said. The investigation surfaced last week during a pretrial hearing in the Manhattan US attorney's insider trading case against Rajat Gupta, a former Goldman Sachs board member accused of passing inside information about the bank and Procter & Gamble to Mr Rajaratnam. Mr Gupta's attorney, Gary Naftalis, said he learnt about the California investigation from the New York prosecutors. Neither Mr Korenberg nor Mr Yook have been accused of any wrongdoing. John Hueston, a lawyer for Mr Korenberg, said, "There is absolutely no connection whatsoever between Matt Korenberg and any of the issues involved in the Gupta case. The investigation that was referenced with respect to Mr Korenberg does not relate to Mr Gupta, has been ongoing for two years and is going nowhere. My expectation is it will soon be terminated. A Goldman Sachs spokesman said, "We have been aware of these allegations for more than two years, investigated them, fully co-operated with federal authorities in this matter and Matt Korenberg remains actively employed by the firm." Mr Korenberg is an investment banker in San Francisco. Mr Yook could not be reached for comment. It is not clear whether the California investigation involving Mr Korenberg is active. A spokesman for the US attorney in Los Angeles could not be reached. Prosecutors are required to share with Mr Gupta's lawyers any material that could be considered exculpatory. The investigation involving Mr Korenberg was identified as part of that obligation. His lawyers have said he and Mr Rajaratnam were no longer friends at the time the alleged tips were passed in 2008. Mr Naftalis has said, "The wrong man is on trial" while citing other people who may have had the alleged inside information and passed it on to Mr Rajaratnam. Two other Goldman employees have surfaced as part of the investigation, but neither has been charged with any wrongdoing.