In a move to stamp out attempted match-fixing and bribery the European Handball Federation says referee names will be kept under wraps until hours before European matches.
Teams, referees and even coaches in several countries have come forward in recent weeks, claiming they were victims of bribery efforts in top European competitions.
The European Handball Federation as well as national federations have launched investigations into the claims and have already suspended some referees.
The EHF is investigating the 2006 men's Cup Winners' Cup final between Russia's Chehovski Medvedi and Spain's BM Valladolid of Spain and its two German referees.
The referees have already been suspended by the EHF after Russian authorities had found money in their bags following the Cup final leg staged in Moscow.
They have denied any wrongdoing, saying they had no idea how the money ended up there.