The threat of strike action will hover over London Underground (LU) employers at pay negotiations tomorrow with the Rail, Maritime and Transport union (RMT).
The union has already carried out one day of strike action, during which over half the Tube services in London did not run.
The RMT is demanding assurances that LU give assurances of a gradual move to a four-day working week for its members.
London Underground has offered a 6.75 per cent pay increase over two years, and a reduction to a 35-hour working week for all staff within that time.
A spokesman for the RMT today said strike action was "obviously" a possibility if RMT demands were not met at tomorrow's meeting.
"We've already got a ballot for strike action under our belt. The executive will then consider strike action depending on what does or does not come out of tomorrow's meeting," the spokesman said.
He added that he could not second-guess what the outcome might be.
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