Depor, who are in administration and fighting to avoid relegation, hammered mid-table Levante scoring three times in the first half just over two weeks ago.
At half-time in the game, Levante midfielder Javier Barkero was reported by local media to have accused some of his team-mates of not trying, sparking a confrontation in the dressing room.
"I have asked for forgiveness from everyone and especially my four colleagues whom I have wrongly accused," Barkero told a news conference on Wednesday.
"I was wrong. I accused them of something that hadn't happened and I want to make that point."
"Any game where there is suspicion will be investigated with all the tools available to the LFP," an LFP spokesman said.
New LFP president Javier Tebas, who was elected to the top job last month, said in a recent interview Spain needed to abandon a culture of "anything goes" that meant some clubs under pressure to avoid relegation were buying games.
"We have to take a step further in denouncing something that is happening, in isolation, but it is taking place," he told sports daily Marca last month, saying any cases would be reported to the anti-corruption authority.
"This must be ended and the clubs are in agreement with me."
