Union boss Bob Crow has told ITV News that he does not use ticket offices at London Underground stations.
Tube workers went on strike until 9pm tomorrow in protest at plans to close all Tube ticket offices with the loss of 950 jobs.
Asked in an interview with ITV News Deputy Political Editor Chris Ship whether he used the ticket offices, Crow replied: "No."
Mr Crow said the ticket offices were necessary for passengers who were partially sighted, could not speak English properly, or were disabled and were unable to use an Oyster card.
However, the leader of the RMT union did acknowledge that if no one uses the offices then there is no reason to keep them open.
Up to two-thirds of Tube services were hit by the strike, while commuters endured difficult journeys on crowded buses and busy roads.
During the same interview, Mr Crow said he did not want to lose his money by cancelling his holiday to Brazil last week as he defended his role in the strike which has disrupted London commuters.
Asked whether he could have cancelled the holiday and booked another one, Crow replied: "What and lose the money?".
Mr Crow insisted he was in close contact while he was away and could have met Boris Johnson and London Underground officials when he returned.
A further two-day stoppage is planned next week in protest at the plans.