Kate McCann, the mother of missing Madeleine, has asked for permission to give evidence at the libel trial of the Portuguese detective Goncalo Amoral.
Gerry McCann has already made the same request. The judge is likely to decide on November 5th.
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The maintenance worker spent 10 days in hospital after plunging 9.5 metres from a scaffold tower at a disused station.
Workers and managers are to stage another strike on Saturday amid a long-running dispute over jobs, pensions and closures.
The unexpected call could prompt a diplomatic rift with China, which regards Taiwan as a breakaway province from its mainland.