Two Wigan MPs have called for urgent talks with Heinz after it announced it is to close five of its factories, cutting up to 1,000 jobs.
The company said on Friday the closures were part of a plan to make £98m worth of savings.
It is not yet known which of its factories will close, but two of them will be in Europe.
Yvonne Fovargue, Labour MP for Ashton in Makerfield, said workers at the Kitt Green site were loyal to the firm.
She said she is working with Wigan MP Lisa Nandy on behalf of Heinz workers in the region.
Ms Fovargue said: "As soon as we heard we did ring the Heinz management and ask for a meeting to allay everyone's concerns.
"We do know that Heinz have made significant investment in the Wigan factory and that they do have a valued and respected workforce there."
A spokesman for Heinz said one factory was set to close in Poland and it was "evaluating potential options elsewhere in Europe".
He added the firm would not decide which factories would close until it had consulted staff and unions.
About 1,200 people are employed at the Greater Manchester factory, which produces beans, soups, pasta meals and baby food.