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Following talks between London Underground (LU) and the RMT, LU issued the following statement.
We remain ready to talk to the RMT at any time to resolve this issue
An LU spokesperson said: "We are dismayed that the RMT is once again proposing to hold London to ransom over the festive period.
"The whole basis of the shorter working week deal is to improve customer service and staff visibility on the network.
"London Underground has been quite correctly implementing the deal hailed a year ago as 'groundbreaking' by the RMT leadership and supported by the membership by a margin of 30-1.
"The RMT is effectively asking LU to dismantle the process and timetable that implements the deal. This is unacceptable to LU and our customers.
"We remain ready to talk to the RMT at any time to resolve this issue.
"This agreed deal is good for London Underground, the RMT's members, and is good for London.
"If the strike does go ahead, London Underground will seek to run services where it is safe to do so."
For 24-hour information on public transport in London, please call: 020 7222 1234.
TfL's Realtime pages display live travel information on London's public transport network: www.tfl.gov.uk/realtime
Journey Planner checks the transport network's status before providing results. The best available route is shown automatically: www.tfl.gov.uk/journeyplanner
Travel alerts via SMS and email can be set up at: www.tfl.gov.uk/alerts
