MOSCOW (Reuters) - Russia has waived entry visa requirements for fans with a valid ticket for the May 21 Champions League Final between Manchester United and Chelsea in Moscow, a match organiser told Reuters on Monday.

"A fan can come without a visa and...enter Russia with a valid ticket," said Alexei Sorokin, the Russian official coordinating preparations for the match. "It is an unprecedented decision by the Russian government."

Tens of thousands of British fans are expected to travel to the match with the Premier League rivals facing each other in the final at the Soviet-era Luzhniki Stadium.

The two English clubs have both been allocated 21,000 tickets each for the match.

Moscow has been planning to host the match for two years. Special measures have already been announced by the game's organisers, with 700 buses scheduled to transport fans from the city's three airports to and from the stadium.

There have been concerns that the city does not have enough hotel rooms to accommodate all the fans, though organisers say there will be enough beds to meet demand.

Arrangements were complicated by a diplomatic row between Moscow and London over the 2006 murder in London of Kremlin critic Alexander Litvinenko.

The dispute has affected the issuing of some types of entry visa between the countries.

(Reporting by Gennady Fyodorov; Writing by Christian Lowe; Editing by Alan Baldwin)