Energean, Greece's sole oil producer, said in a statement it was in the process of developing Israel's Karish and Tanin offshore fields and was "engaged in a range of contracting and financing discussions to achieve this."
"We are currently examining all options of funding the project's requirements," a company spokesman said in an email, without saying if this included a public listing.
Four sources, including three banking sources, told Reuters that investment banks Morgan Stanley (>> Morgan Stanley) and Citi (>> Citigroup) were advising the firm on the initial public offering (IPO) process.
The banks did not immediately respond to requests for comment.
If management opted for an IPO, the listing would take place next year although it was unclear how much cash Energean would seek to raise, the sources said.
Energean, a private exploration and production firm operating in the eastern Mediterranean, and private equity fund Kerogen Capital bought the Karish and Tanin licences from Israel's Delek Group (>> Delek Group Ltd.) in December 2016 for an upfront cost of $40 million and $108.5 million in contingent payments.
Led by Chief Executive Mathios Rigas, Energean expects to make a final investment decision on developing the fields, estimated to hold 2.4 trillion cubic feet of gas, by the end of 2017. The development is expected to cost $1.3 billion to $1.5 billion, according to the company website.
Energean said in May it had signed contracts to supply up to 23 billion cubic metres of natural gas to private Israeli power stations from the fields.
London energy listings have been sporadic and small in the past three years as a dip in oil prices dried up investor interest. But 2017 has seen eight such listings on London's junior market so far, compared to five in the whole of 2016, when oil prices reached a 12-year low of around $26 a barrel.
Benchmark Brent crude <LCOc1> was trading above $62 a barrel on Monday.
(Additional reporting by Clara Denina in London; Editing by Veronica Brown and Edmund Blair)
By Ron Bousso and Karolina Tagaris