UEFA have confirmed they are continuing investigations into seven European fixtures suspected in a massive match-fixing operation.
The case was first brought to light by the authorities in Germany, but UEFA has now opened its own investigation.
Following meetings on Wednesday with nine national football associations, Europe's governing body has named five clubs as being those under scrutiny.
The clubs are KF Tirana and KS Vllaznia of Albania, FC Dinaburg of Latvia, NK IB Ljubljana of Slovenia, and Budapest Honved of Hungary.
Seven matches, one a Champions League qualifier and the other six Europa League qualifiers, all played between July 16 and August 6, are under investigation.
In a lengthy statement, UEFA added it was also looking into the roles of three referees and one other official in the case.