Pakistan left-arm spinner Abdur Rehman is facing a ban after testing positive in a dope test during his stint with Somerset in the English domestic season.
It is believed the drugs were recreational and not performance enhancing, reports the Daily Times.
Rehman, 32, was expected to join a Sialkot Stallions conditioning camp this week at the National Cricket Academy ahead of the Champions League Twenty20 but did not turn up to join the squad.
The Pakistan Cricket Board (PCB) has withdrawn Rehman from the Sialkot Stallions squad due to play in the Champions League Twenty20. Sialkot are set to fly to South Africa on October 7 to play a qualifying round of the tournament starting on October 9 in Johannesburg.
"We have withdrawn Rehman's name from the list after the England and Wales Cricket Board informed us that he had tested positive in a dope test taken in August after a county match," a senior PCB official said.
The official said the PCB had sought more details from the ECB and would support any penalty imposed on Rehman.
"Rehman has returned to Pakistan and from what we know his samples came back positive," he added.
The official said that under the rules of the World Anti-Doping Agency, the test results were only released to the player and his home board, which was the ECB at that time.
Rehman said he did not know why he had failed the dope test as he had taken no prohibited substances or drugs.
"I don't know what has happened. I am also in the dark as I don't use medicines or substances," Rehman said.
Pakistan fast bowlers Shoaib Akhtar and Mohammad Asif had also failed dope tests at the 2006 Champions Trophy. Asif was also banned for five years for spot-fixing and jailed last year for the same offence in the UK. (ANI)