Top Dutch referee Serdar Gözübüyük has been named as a suspect in an investigation into match-fixing in Germany, the Volkskrant said at the weekend.

The paper said Gözübüyük is named in documents which form part of the German case against Dutch national Paul R, known as Rooie Paul, who goes on trial on Tuesday.

The matches include two Jupiler League matches in 2009, which the Dutch football association KNVB earlier described as suspicious.

Gözübüyük, now 29, told the Volkskrant he had no involvement in match-fixing. ‘Let me say it one more time. I am clean,’ he said. ‘It is my role to ensure two teams play a fair and just match.’

The KNVB said in a statement that Gözübüyük’s integrity was not up for discussion, and pointed out that he had been praised by both the KNVB and Uefa for his work.

Gözübüyük is refereeing Saturday night’s key Eredivisie game between PSV and Heerenveen which could give the Eindhoven club the title.