"As an eyewitness to match-fixing, I will reveal the names of those involved if my security is guaranteed," Tillakaratne told reporters after the Criminal Investigations Department grilled him for the second time this week.
His wife Apsari said the family feared for their lives, as they have received several death threats warning against identifying those involved.
Now an opposition politician, Tillakaratne claimed last week that Sri Lanka players had been fixing matches since 1992 and told reporters on Tuesday that he would name names to the International Cricket Council.
"I made the statements (about match-fixing) neither to get political mileage nor to put anyone in an awkward position," he said on Tuesday.
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"I made the comments in good faith and I will share the information with the ICC. The exercise was meant to protect the game and the players we all love so much.
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Tillakaratne, who played 83 Tests and 200 one-dayers during a 15-year career, said he had kept quiet fo