OTA Love Holidays is reported to be on the brink of being bought for £180 million.
Sky News has reported that private equity firm Livingbridge will announce the acquisition this week.
Livingbridge has previously invested in On The Beach and is also the owner of holiday home rental business Sykes Cottages.
If the acquisition goes through, it is thought that Love Holidays, which specialises in short-haul trips, will move into the long-haul market.
However, Livingbridge declined to comment when contacted by Sky on Tuesday.