Public sector union Unison is threatening to make hundreds of equal pay claims against Coventry City Council in a gender pay gap dispute.
The union’s lawyers are looking at the case for submitting hundreds of claims from lower-paid female workers.
Unison pulled out of negotiations when the council announced it was implementing pay and conditions changes on 1 June, without the agreement of trade unions.
There have already been three days of strikes by thousands of staff belonging to Unison and the T&G union about the controversial changes, under which some staff stand to lose up to £8,000 a year.
The threat of further strikes is also looming - Unison claims it has groups of key workers “ready and willing” to strike.
Unison will hold a rally in the city centre on Saturday, 23 July.