Tata Steel is expected to announce 1,200 job cuts at its Scunthorpe steel plant next week.
It is thought that the company could also axe more jobs in Scotland.
Tata has not denied reports which said it would reduce the 3,000-strong workforce at one of the UK’s biggest steel plants.
The additional job losses come as unions call on ministers to take “concrete and positive” action to save the UK steel industry.
The steel sector is in crisis following the decision by SSI to close its blast furnace and coke ovens in Redcar.