"The results of the second sample are still awaited but on basis of the first sample results, the board has already established a two-member committee to chargesheet the spinner and seek an explanation from him," the source said.

Hassan, 22, who has played one ODI and 10 Twenty20 Internationals, has been advised to hire a lawyer to submit his answer to the committee that includes a qualified sports medicine doctor and former Test player, Colonel Naushad Ali.

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"The PCB is taking the matter very seriously because this is the first time any player has tested positive for the use of cocaine," the source said. 

"If Hassan can't clear himself before the inquiry committee, he faces a two-year ban from all cricket," he added.

In the past also some Pakistani cricketers have tested positive for banned substances, including fast bowlers Shoaib Akhtar and Muhammad Asif who had to be dropped for the 2007 World Cup because of their problem.