The London-based trading unit of Russia's Gazprom Pao has laid off about 20% of its workforce, including at least six directors, the Wall Street Journal reported on Nov. 18.

The job cuts by Gazprom Marketing & Trading include 170 people in London and followed a cost savings review by consultancy Oliver Wyman, the newspaper said, citing two people familiar with the matter.

Gazprom Marketing & Trading expects a big fall in profits at some of its units this year, the newspaper reported.

Oliver Wyman and Gazprom Marketing & Trading were not immediately available for comment.

Gazprom, which had about 462,400 employees as of Dec. 31, and other oil and gas companies have been hit by a 60% slump in oil prices since mid-2014.