French authorities are investigating potential match-fixing in Paris St-Germain’s 6-1 Champions League win over Red Star Belgrade this month.
A Red Star official allegedly placed a bet of almost 5m euros (£4.3m) for the Serbian club to lose by five goals, reported French newspaper L’Equipe.
The French National Finance Prosecutor (PNF) is investigating the claims after being alerted by Uefa.
Both clubs have denied any wrongdoing.
A Red Star statement read: “FC Red Star with the highest anger and abomination rejects the story.
“The article can harm and bring big damage to our club’s reputation and that is why we insist that Uefa and investigators in Serbia and in France investigate the whole story and get the truth.
“Today’s technologies and other mechanisms are so improved that it is basically impossible to leave this case unsolved.
“Red Star expects to get the truth at short notice and remove any doubt about our involvement in possible wrongdoing.”
In a statement, PSG expressed their “amazement and indignation”.
They added: “Paris Saint-Germain reiterates its commitment to a fundamental principle of sport, that of the integrity of competitions and therefore refutes any form of practice that could call into question that integrity.”