But the ICC has rejected claims the tournament will be postponed, insisting a number of contingency plans are being considered.
The Australian opener left Lancashire after only one match last year due to a fatigue disorder.
Chief executive Kevin Roberts is hopeful the four-Test home series against India will go ahead.
Australia is due to stage the global tournament from October 18 until November 15.
A few Australian fans were evicted from the MCG during the third day's play of the Boxing Day Test against India due to racist chanting aimed at India players.
Cricket Australia (CA) will limit their national team's players availability in next year's Indian Premier League (IPL) as they gear up for the 2019 World Cup and the Ashes in the UK.
Mark Taylor announced on Monday that he has decided to step down from his a Cricket Australia (CA) Board director, effective immediately.