UPDATE 1-Soccer-Judge passes on alleged Bayern-Zenit fix tape

(Adds UEFA reaction)

MADRID, Oct 1 (Reuters) - A Spanish judge has sent German authorities recordings that allege Russian mafia figures tried to fix last season's UEFA Cup semi-final between Bayern Munich and Zenit St Petersburg, judicial sources said on Wednesday.

Russian champions Zenit crushed Bayern 4-0 at home in the second leg to win 5-1 on aggregate before going on to beat Rangers in the final.

Spanish newspaper El Pais said the Operation Troika investigation against the Russian mafia led by investigating judge Baltasar Garzon had uncovered evidence the second leg might have been fixed.

"The judge has sent to the German attorney general part of the conversations that were intercepted in Spain during the investigation into Russian plots in our country," judicial sources told Reuters.

Bayern Munich said on Wednesday they had no information about the reports.

"Bayern know as little about this as the Munich prosecutor's office," the club said in a statement. "We will try to obtain all the information available."

Zenit were not immediately available for comment.

A UEFA spokesman said his organisation "was aware of the report".