He said members had not been balloted for strike action, so any participation would be illegal.
The original ballot saw 92.5% of those balloted vote in favour of industrial action.
Paramedics and other ambulance staff will be balloted from 6 March with a strike, said Unite.
Almost 250, 000 civil servants were balloted in a row encompassing job losses, pay and pensions.
It said members were balloted before Christmas over compulsory redundancies in the "Delivering Quality First" cuts.
Tube workers are to be balloted for strikes in protest at plans to test driverless trains.
The 2, 000 drivers being balloted account for 90% of those supplying petrol to UK forecourts.
Paul Wade from the GMB union said members would be balloted when the final proposal was confirmed.
Ambulance workers in Yorkshire are to be balloted over strike action in a row over staffing changes.
The GMB union has said its members in the council's Cityclean department are being balloted for industrial action.
Unison recently balloted its members regarding strike action, after a 5.4% pay cut was imposed on council staff.
Thousands of drivers and other employees are being balloted for strikes in a dispute over pay and jobs.
Workers at a brewery in Staffordshire are to be balloted for strike action in a row over working conditions.
Of the 5, 720 workers balloted 63% voted to accept the road map deal, with 37% opposed to the measures.
BBC: NEWS | UK | England | West Midlands | Land Rover workers accept changes
The union Unite balloted 82% of the workforce and 87% of those balloted voted in favour of the action.
About 35% of the workforce at Daventry District Council are members of trade unions that have balloted for industrial action.
Bus workers in Devon and Cornwall are being balloted over possible strike action in a dispute over "essential" staff transport.
BBC: First Devon and Cornwall bus staff in RMT strike ballot
In 2010, Unite balloted its members at the company and concluded that 98% of staff wanted to stay in Dursley.
We have balloted our members to see if they are willing to take strike action and they say they are.
The RMT union said hundreds of its members will be balloted on whether to launch a campaign of industrial action.
Thousands of BBC journalists and technical staff are to be balloted for strike action over increased workloads, stress, and job losses.
Staff at a hospital trust in West Yorkshire are being balloted for industrial action after 74 employees were sent redundancy letters.
Workers on the Piccadilly Line on London Underground (LU) are to be balloted for strike action in a row over working conditions.
BBC: Piccadilly Line Tube workers balloted for strike action
Union members among the company's 7, 000-strong UK workforce are to be balloted on strike action over a planned pay freeze next year.
Baroness Randerson was opening a balloted debate on the progress being made by the commission on devolution in Wales, on 19 July 2012.
Students at the University of Glasgow were balloted using the same question as will be used in the referendum itself, due next year.
Party members, trade union members, MPs and MEPs will be balloted on the Labour leadership and the result will be announced on 25 September.
Members of the NUJ union are to be balloted for strike action on the same day the newspapers print their final editions - 1 October.
Unison members were balloted after 74 employees were sent redundancy letters.
Those balloted included clerks, receptionists, medical secretaries, waiting list and call centre staff working at Dewsbury, Pinderfields and Pontefract hospitals as well as community clinics across the Wakefield district.
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