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Thomas Cook confirmed Friday that it is seeking 200 million pounds in new capital. The company's largest shareholder is Chinese investment company Fosun.
The money required would be a "seasonal stand-by facility" and come on top of the 900 million pounds of new capital already raised, the company said.
Any failure to raise the required capital would elicit questions about the jobs of the 22,000 staff Thomas Cook employs around the world, including 9,000 in Britain.
A collapse could leave around 150,000 travelers from Britain stranded, along with tens of thousands of travelers from other countries. The British government may have to lease planes to get its citizens home.
United Kingdom foreign minister Dominic Raab acted as though a government bailout of the travel firm was unlikely, The Guardian reported.
Thomas Cook's predicament comes about half a year after Icelandic budget airline Wow Air said in a statement that it has ceased operations, stranding passengers.
The Associated Press contributed to this report.