Robert Hoyzer, the referee at the centre of the German match-fixing scandal, has told prosecutors that a gambling ring obtained secret lists of Champions League referees before they were published.

Hoyzer said he saw lists of UEFA’s referee appointments about a week before the matches were held, according to a report in Der Spiegel.

A UEFA spokesman declined to comment on the details of the report but said the identity of referees for Champions League matches were withheld until 48 hours before kick-off.