Patients with appointments in St George's will be notified of any changes during the junior doctors strike, the hospital has confirmed.
There will be a 24 hour walkout on Tuesday, January 12, after negotiations between the British Medical Association (BMA) and the government broke down.
January 5: Junior doctor strike back on after negotiations with government flounder
A spokesman for St George's Hospital said: "If there are changes to an appointment that you have arranged at our hospitals on any day of action, we will contact you.
"If you do not hear from us, please assume your appointment remains unchanged.
"The latest information will be posted to this page on the trust’s website, Twitter and Facebook."
December 1: Delays and disruptions at Epsom and St Helier despite junior doctors' strike being called off
November 30: Patients told not to attend St George's appointments as junior doctors go on strike
November 30: St George's strike called off as junior doctors reach agreements
BMA council chairman Dr Mark Porter said the doctors were committed to reaching an agreement which would be best for patients, junior doctors and the NHS.
He said: "Despite overwhelming support for industrial action, the BMA instead sought conciliation talks with the government.
"After weeks of further negotiations, it is clear that the government is still not taking junior doctors’ concerns seriously.
"Furthermore, the government has repeatedly dragged its feet throughout this process, initially rejecting our offer of talks and failing to make significant movement during negotiations.
"We sincerely regret the disruption that industrial action will cause, but junior doctors have been left with no option."
The BMA cancelled three strikes last month to go into talks over the new contracts.
Under the contracts junior doctors in England will get an increase in their basic pay, but will have to work more weekends while guaranteed pay rises linked to time in the job will be axed and bonus pay for working unsociable hours will be curbed.
Health Secretary Jeremy Hunt said: "Our absolute priority is patient safety and making sure that the NHS delivers high-quality care 7 days a week – and we know that’s what doctors want too, so it is extremely disappointing that the BMA have chosen to take industrial action which helps no-one.
"We had made good progress in talks, resolving 15 of the 16 issues put forward by the union – everything apart from weekend pay.
"We have now asked ACAS to reconvene talks in the hope the BMA will return to sensible negotiations."
Some 98 per cent of junior doctors balloted by the BMA voted for industrial action.
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