El Salvador players were offered financial incentives before Tuesday’s World Cup 2018 qualifying game against Canada according to the country’s football association.
It said Salvadoran businessman Ricardo Padilla offered the players money to win, draw or avoid a heavy loss.
A heavy defeat could see Canada progress at the expense of El Salvador’s neighbours Honduras.
World football governing body Fifa has confirmed it is investigating.
We want to make it clear that we are against anything of this kind
In a recording played by El Salvador’s captain Nelson Bonilla at a news conference, Padilla promised various amounts of money to players depending on the result.
The amounts ranged from $30 (£22) a minute for a win to $10 (£7) a minute for a 1-0 defeat.
“In reference to what we heard, we want to make it clear that we are against anything of this kind,” Bonilla added.
“We want to be transparent about everything that has happened with the national team.”
Fourteen El Salvador players were previously banned for life in 2013 after being found guilty of match-fixing.