US secretary of state Hillary Clinton is expected to return to work next week, almost three weeks after being sidelined by a concussion.

Spokesman Philippe Reines said Mrs Clinton continues to recuperate at home and will resume her office schedule next week.

He said Mrs Clinton had no schedule this week because of a long-planned holiday.

Aides and doctors said Mrs Clinton contracted a stomach virus in early December and became dehydrated, then fainted, fell and hit her head.

She was diagnosed with a concussion on December 13 and has not been seen in public since.

Mrs Clinton's illness led her to cancel an overseas trip and scheduled testimony before Congress about the deadly attack on the US Consulate in Benghazi, Libya.

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