Karachi - Former Pakistan Cricket Board (PCB) chairman Zaka Ashraf is contemplating suing his successor, Najam Sethi for defamation after he was accused of not accounting for Rs 20 million spent during his 22-month tenure and also of gross mismanagement. A source close to Ashraf told PTI that the ousted chairman had been consulting his lawyers over the issue as he was very upset with the allegations of misuse of funds and mismanagement being made out against him by Sethi and the present managing committee of the board. "He has also consulted his close aides including former captain Aamir Sohail and he is now seriously thinking about filing a separate case against Sethi for defaming and launching a smear campaign against him," the source said. Ashraf remained chairman unhindered from late 2011, but since May 2013 he and Sethi have been in and out of the PCB chairman's post due to legal complications and Ashraf since January has twice been reinstated by the Islamabad High Court (IHC) and then removed to make way for Sethi. The Sethi-led managing committee earlier this week held a meeting in which it an inquiry should be held into the spending of around 20 million rupees during the tenure of Ashraf which were not accounted for. Even before that Sethi-led board had released a internal audit report of Ashraf's tenure in which he was accused of mismanagement and misuse of funds. The audit report claims Ashraf spent money from the board coffers on luxury and on travel and is also accused of using board money to purchase tickets for the Champions Trophy in England for his friends and relatives. Ashraf denies he misused or mismanaged board funds said this was a smear campaign against him by Sethi and company.