from all forms of the game after a disciplinary hearing over allegations in the television sting.
SLC did not give details of the hearing nor the allegations against the pair, but official cricket sources said the disciplinary panel found sufficient evidence to punish them.
A source close to the disciplinary enquiry said Gallage declined to participate in a hearing.
"It is clear from the evidence that the two umpires had negotiations with the Indian party (TV sting) and agreed to provide information for monetary benefit," the source said asking not to be named.
"But, neither of them were in a position to provide any information because they were not involved in umpiring any of the first class matches at the time."
A third umpire, Gamini Dissanayake, was demoted to umpiring in a lower domestic league for a period of one year, the SLC said, after the television network said it had approached him to discuss matches.
Dissanayake, the most high-profile of the three umpires who declared his innocence when the programme was aired in October, has not been directly implicated in any bribery allegations, the source said.
However, he was faulted for engaging in conversation with the Indian party who had offered him money in exchange for information about teams and players.
"From the tapes, it is clear that he did not agree to provide information, but he should have stopped the conversation with the Indian party," the source said.
Dissanayake officiated at two warm-up matches during the World Twenty20 last year and has also been a reserve umpire for international games when India, Pakistan and other nations have toured Sri Lanka.
There was no immediate comment from the three umpires.
The undercover investigation by the India TV channel allegedly found six umpires, including one on the international circuit, were willing to give biased decisions or provide inside information on teams in return for payments.
Three of the six named by the TV programme were from Sri Lanka, while two were from Pakistan. The sixth was Nadir Shah, a Bangladeshi member of the International Cricket Council's international panel which officiates in matches around the world.
Shah was banned for 10 years by Bangladesh authorities in March.
Grainy footage appeared to show Shah, who has stood in 40 one-day internationals and a number of Twenty20 internationals, saying he was willing to give decisions on demand.