Updated

Rolling Stones (search) drummer Charlie Watts (search) is being treated for throat cancer, a spokesman for the band said Saturday.

Watts, 63, was diagnosed in June and has completed four weeks of a six-week course of radiotherapy at London's Royal Marsden Hospital.

"He is expecting to make a full recovery and start work with the rest of the band later in the year," the spokesman said, speaking on condition of anonymity.

He said Watt's treatment had not interfered with any tour or recording plans for the Stones, who have been "relaxing between work commitments" following a world tour last year.

Known as the most laid-back member of the band he joined more than 40 years ago, Watts has also performed with a variety of jazz ensembles.