Beer workers at the Carling plant in Burton-on-Trent, are to hold a strike ballot later this month.
The union Unite claims more than 400 staff at Molson Coors could be sacked after June 10, and reinstated on less pay.
The union says nearly 200 workers could lose as much as £9,000 a year in wages.
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Any early cloud will break, with some sunny spells developing during the morning.
Generally cloudy with fairly persistent rain through this evening.
A cloudy evening, with sporadic outbreaks of rain or drizzle. These will ease away overnight, with a few clear spells around dawn.