Eight to 10 matches in the top two tiers of Spanish football will be fixed this season, the La Liga president has said.
Javier Tebas revealed his fears at a conference of football executives where he also unveiled plans to impose life bans on players and officials involved in match-fixing.
"Many people try to fix many more games than those eight to 10," AP quotes him as saying.
The fight against match-fixing was helped by the arrest last month of 14 people in Singapore, including Dan Tan, who allegedly co-ordinated a global crime syndicate that rigged Italian matches and other games across the world.