LONDON, Nov 5 (Reuters) - The Russian central bank bought more than $15 billion on the foreign exchange market in October to keep the rouble's appreciation gradual, the bank's deputy chairman, Alexei Ulyukayev, said on Thursday.

The rouble's recent strengthening is causing concern in some sectors of the economy, Ulyukayev said. A stronger rouble makes exports more expensive.

Ulyukayev also told reporters that monthly inflation in November should be around 0.2-0.3 percent, and a similar level of inflation could be expected in December, following the zero price growth observed in October.

(Reporting by Toni Vorobyova; writing by Lidia Kelly in Moscow) Keywords: RUSSIA/ULYUKAYEV

(lidia.kelly@reuters.com; +7 495 775 1242)

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