The majority are reportedly based in Port Talbot, where the company is scheduled to shut the second blast furnace in September.
Tata Steel has already decommissioned one of the two blast furnaces at Port Talbot, the largest steel plant in the UK, as part of its strategy to transition to greener production methods.
The restructuring, which is expected to lead to approximately 2,800 job losses, aims to curb daily losses exceeding £1m, according to Tata.
According to reports, Tata Steel said it had begun assessing whether those who had expressed an interest in taking redundancy were in roles which could be closed.
Within weeks, the first of 2,800 workers are expected to lose their jobs, reports said. They added that unions have pledged to ballot their members on whether to accept the redundancy deal.
A Tata spokesperson said the company had completed the process through which around 5000 employees across South Wales were given the opportunity to indicate whether they might be interested in taking voluntary redundancy.
They said Tata was currently working through how people’s aspirations may align with the future organisational structure requirements.
"Whilst we have made great efforts to put together an employee support package that will help many of those people affected to transition out of the business, it is also vital that we retain our core knowledge, skill base and experience through this most challenging of times," they added.
Funding of £13.5m has been made available by the UK Government to support supply chain businesses and workers affected by Tata Steel's transition to greener production methods.
Welsh secretary Jo Stevens made the announcement earlier this month at her second meeting as chair of the Tata Steel/Port Talbot Transition Board.
