Kraft Heinz has "re-evaluated" the future of its Wigan site after a £140m investment was diverted to factories in Europe.
The giant said it was "disappointing" that the Kitt Green site missed out on the funding but was a "direct result" of a ballot of staff last year which rejected a package of measures to modernised working practices at the site.
The company added that it is "working to ensure that the right level of investments continue to be made at Kitt Green which remains one of the most important facilities within our network".