The Oslo-based carrier has set up a steering group and appointed financial and legal advisors to oversee the situation following IAG’s bid.
IAG is thought to be positioning itself for talks over a full takeover of the low-cost operator.
The disclosure came as Norwegian announced its first quarter earnings for 2018 on Thursday (April 26).
The airline said it had reduced first quarter losses to 46.2 million NK (£4.18 million) from 1.5 billion NK (£135.4 million) last year.