The man, who has not been named, has been taken to Northwick Park Hospital in Harrow, north London.
A hospital spokesman said: “He has flu-like symptoms and is responding well to treatment.”
The spokesman added that the hospital was scrupulously following infection control procedures “to ensure there is no risk to any other individual in the hospital.”
It comes as the UK was placed on health alert following a deadly outbreak of swine influenza in Mexico and the US.
The World Health Organisation has warned all nations to keep a look out for unusual flu cases. Its director-general Margaret Chan said the outbreak constituted a “public health emergency of international concern” and had “pandemic potential”.
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