MOSCOW, Nov 24 (Reuters) - Russian retailer Magnit said on Friday it had purchased an additional block of shares from foreign shareholders, completing a buyback that has given Western investors a chance to recoup some assets stranded in Russia.

Magnit bought back outstanding shares worth around 48.5 billion roubles ($540.6 million) in September, but held an additional tender offer of 7,899,569, equating to approximately 7.8% of all issued shares, to give more investors the opportunity to exit Russian asset holdings. (Reporting by Reuters; Writing by Alexander Marrow Editing by Gareth Jones)