Timberlake's first two solo albums have sold more than 13m copies

The star, who has been touring for months and recently performed at the MTV Music Video Awards, will play the California dates in two weeks' time.

The 26-year-old is suffering from vocal strain due to his performing schedule.

Timberlake collected four awards at Sunday's awards gala in Las Vegas, including male artist of the year.

According to his website, the star's voice was affected by his performances at the award ceremony in Las Vegas "and months of rigorous touring".

The two shows, in San Jose and Sacramento, have been rescheduled for 23 and 25 September respectively.