Ferrovial SA is in talks with buyout firms PAI Partners and Greybull Capital LLP over a potential sale of the Spanish infrastructure operator's subsidiary Amey PLC, a U.K.-based provider of construction-related support services, the Financial Times reported, citing sources close to the seller.

The struggling unit may be sold "with other parts of the business to find a buyer," one source said. The FT reported previously that Ferrovial is considering the sale of its global services division, which includes Amey.

The company confirmed earlier this month that it had "engaged an external adviser" to review the possible divestiture of some or all of the services division's assets, but that it had not made a final decision.

Amey, which Ferrovial acquired in 2003 for £81 million, employs about 19,000 people in the U.K. and provides services for the Ministry of Defense and Ministry of Justice.

Greybull and PAI declined to comment, the FT said.