German referee Robert Hoyzer has admitted match-fixing charges and has promised to co-operate fully with an ongoing investigation.
Robert Hoyzer will co-operate fully with the investigation
"The accusations that have been raised in public are true," he said. "I regret my behaviour profoundly and apologise."
The German Football Federation had said he was under suspicion of rigging a Hamburg SV cup match last year.
The DFB investigation has now been widened to include five more matches Hoyzer was involved in.
He had initially denied the charges, but said on Thursday: "I have documented completely and unsparingly my behaviour and my entire substantial knowledge of all facts and people known to me in this matter."
Hoyzer has told state prosecutors Friday that other referees and players were involved in the scandal, German newspaper Sueddeutsche Zeitung newspaper reported on Friday.
According to the newspaper, he said he had been present when other referees received money from a Croatian-controlled betting ring in Berlin and had heard of players getting paid.
Earlier in the week, Hoyzer's lawyer strongly criticised the DFB's handling of the case and said his client had been pressured into signing a resignation letter.
The match at the centre of the allegations involved Hamburg SV against lower-league Paderborn where Hoyzer sent off one Hamburg player and awarded Paderborn two penalties.
Hamburg were leading 2-0 but went on to lose 4-2. Manager Klaus Topmoeller was later sacked.