Aero engine manufacturer Rolls-Royce is to cut 2,600 jobs across its aerospace business.
It is unclear at the moment if the Hucknall site is affected, or how many of the cuts would be made at the company's nearby civil aerospace division in Derby.
Around 800 people are employed at the Watnall Road site, which makes engine combustion components and also carries out testing and development.
At the Sinfin site, around 12,000 people are employed at the site.
The Trent family of engines is made there.
Rolls-Royce said the cuts were part of a "restructuring programme to improve operational efficiency and reduce costs" and would be made over the next 18 months.
In a statement, the firm said: "A large engineering team was required for the development phase of the Trent 1000 and Trent XWB engines.
"Both these major programmes have now entered their production phase, reducing our engineering requirement."
The Trent 1000 and Trent XWB teams are both based in Derby.
