Portugal's Galp Energia is holding a tender to sell four to six Nigerian liquefied natural gas (LNG) cargoes annually over five years, trade sources said.
Galp is a long-term buyer from the Nigerian LNG export project on Bonny Island, and has regularly sought to offload supply onto the spot market in recent years.
One of the sources said the tender could be awarded at the end of the month.
(Reporting by Oleg Vukmanovic and Sarah McFarlane; editing by Susan Thomas)