Up to 90 jobs are under threat at a subsidiary of Aberdeen and Inverness-based Global Energy Group.
Isleburn, which employs more than 600 people at operations in the Granite City and Evanton in Easter Ross, stressed that the potential redundancies may not happen.
A statement from the firm said: “We deeply regret having to take this action which, if required, is likely to commence around the beginning of June.
“We are no different from many companies within the oil and gas industry at this time in suffering from a considerable downturn of business within our marketplace.
“Over these last few weeks we have taken a thorough review of our current order book and our current workforce skill sets, and we have been left no choice but to take this regrettable action of advising our people about potential redundancies.
“We continue to work hard in trying to find and secure further work to supplement our existing order book and hope our situation might change in the coming weeks.
“However, for the present, we will be giving notice of redundancy to some of our workforce, with the figure unlikely to go beyond 90 people.
“Our people were advised sometime ago of the review being undertaken and we will be doing all we can to keep the redundancy numbers to a minimum, alongside assisting those affected in whatever way we can.”
Founded in 1982, Isleburn describes itself as a world-leader in the manufacture of bespoke equipment for subsea oil and gas projects.
Its website adds: “We also have a highly successful track record in the topside and power and process sectors. Our experience and expertise is increasingly in demand from companies developing offshore renewable-energy devices.
“We work with operators and installation contractors around the world, who recognise our proven ability to deliver value and reduce risk in projects of all sizes.”