Labor has agreed to back the government's move to make it a crime for Australians to travel to terrorism hot spots.
But at least four caucus members say there are not enough safeguards in the laws, which will be debated in the Senate and possibly passed on Tuesday.
The foreign fighters bill was the focus of a caucus debate in Canberra, in which four MPs spoke in favour and four against.
One of those against the bill said that anti-terrorism laws should not be changed while the position of the Independent National Security Legislation Monitor remains vacant.
The Abbott government initially wanted to abolish the role as a budget savings measure but reneged on the decision.
But the monitor role - established to review the operation of counter-terrorism and national security laws and ensure rights are protected - has been vacant since April.
The bill will also provide law enforcement agencies with extra powers to investigate, arrest and prosecute those who advocate terrorism.
The government has agreed to make a number of amendments to the bill in line with a bipartisan committee report.
Labor will also be pushing for tighter amendments on a number of definitions in the bill.
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