SINGAPORE, July 29 (Reuters) - Russia's Sakhalin Energy Investment Co has requested its liquefied natural gas (LNG) customers to make payments via a Moscow unit of a European bank and is in talks to change the payment currencies away from U.S. dollars, two sources familiar with the matter said on Friday.

Some of the buyers are already paying via the designated bank but these payments are still made in U.S. dollars, the sources said.

(Reporting by Florence Tan in Singapore and Yuka Obayashi in Tokyo; Editing by Jacqueline Wong)