International Airlines Group said on Wednesday that it was considering making an offer for 100 percent of the share capital of Spain's Vueling Airlines.
IAG, which owns Spain's Iberia and British Airways, said its board would discuss the potential takeover on Thursday.
"Following media reports, International Consolidated Airlines Group, S.A. (IAG) can confirm that it is considering making an offer for 100 per cent of the share capital of Vueling Airlines," the company said in a statement.
"The IAG board will be considering the matter tomorrow (Thursday) but no decision to make an offer has yet been reached nor, accordingly, on any of its potential terms, including in particular the price."
It added: "Further announcements will be made in due course when a decision is made."
Iberia already has a 45.85 percent shareholding in the Barcelona-based Vueling, Spain's fourth largest airline in terms of passenger numbers.
Vueling announced last month that it was expanding its network in 2013 to a total of 100 airports, with London, Frankfurt and Dusseldorf among the new destinations.