El Salvador players have alleged that they were approached by a businessman seeking to fix Tuesday's World Cup qualifier against Canada.
The squad held a press conference on Monday in which an audio recording was played that they insist proves their claim.
While El Salvador cannot progress to the next phase of qualifying, Canada can overhaul Honduras in Group A and go through at their expense – but only on goal difference, with a five-goal deficit to overhaul.
El Salvador forward Nelson Bonilla said: "With respect to what we just heard, we want to make clear that we're against this anything like this act.
"We want to be very transparent in front of the public about anything happening with the national team and want to disassociate ourselves from whatever bad impression this event could cause."
