The senior Board official told The News on condition of anonymity that the Board has been receiving reports that Sohail is a 'law-breaker' and could be in deep trouble like his team-mates Shoaib Akhtar and Mohammad Asif.
''It seems quite clear that Sohail Tanvir is on a disaster course,'' said the official.
''According to our information he has breached discipline on several occasions in the past and could land himself in serious trouble,'' said the official.
According to the insiders in the Pakistan team, Sohail doesn't even listen to his captain Shoaib Malik or team officials Talat Ali (manager) and Geoff Lawson (coach).
So far, Sohail, 23, has escaped punishment because his poor conduct is overshadowed by bigger scandals in Pakistan cricket involving dope-tainted pacers Shoaib and Asif.
However, with Shoaib and Asif out of the national team, there are indications that the Board might zero in on Sohail if he fails to improve his conduct.
''Yes, we have been receiving reports about Sohail's lack of discipline and we are concerned,'' said the PCB official.
When asked why the Board is yet to take any action against Sohail, the official said that the PCB expects the team management to ''do its job first''.
''It's the team management's job to give an erring player a dressing down, that's the standard procedure,'' said the official. ''If the player doesn't improve then they should report him for further disciplinary action,'' he said.
The left-arm pacer has taken 36 wickets from 24 one-day appearances. He made his international debut last September in the inaugural World Twenty20 Championship in South Africa.