The Federation of International Cricketers' Association (FICA) say most international players are reluctant to play a part in the tournament, which will feature five teams and is scheduled to begin in March.
FICA chief executive Tim May told BBC Sport: "I think you'll find the majority of current international cricketers will heed our advice."
Former Australia spin bowler May added: "The security consultants came back and said that the risk of touring Pakistan in a cricketing sense is unmanageable.
"I haven't spoken directly to any players but the feedback we are getting from player associations throughout the world is that players are very appreciative and understanding of the advice.
"We can't force the players not to go but I think you'll find the majority, if not all, of current international cricketers will heed that advice and, unfortunately for Pakistan, not participate in this event this year."
FICA, which is an umbrella organisation for player unions in major cricketing countries, is conscious that cricketers have been targeted in Pakistan before.
The Sri Lanka team bus was the subject of a deadly attack in Lahore in March 2009 as it made its way to the Gaddafi Stadium for the third day of the second Test against Pakistan.
Pakistan have played 'home' fixtures at neutral venues including Dubai and Abu Dhabi since that attack.