Kim Jae Hong, 27 and Jeon Byungeuk, 24, the former having been a regular for the Eagles most recently, were found guilty under the Prevention of Corruption Act on Friday.
Both Koreans had attempted to bribe two current Geylang players into throwing the match against Harimau Muda on May 3.
Kim had flown in to Singapore from South Korea, under instructions from an unnamed party and asked to bribe goalkeeper Mohamed Yazid Mohamed Yasin, 32, S$4,000 into ensuring that his team was behind at half-time and lost the tie at the final whistle.
Yazid was also promised a further S$2,000 if he had successfully overseen the fixed outcome.
Kim also conspired with Jeon to bribe Mun Seung Man in April. Jeon attempted to bribe his fellow countryman to not score in the same fixture against Harimau Muda.
Both Kim and Jeon were promptly arrested in a sting as they handed over the cash to Yazid on May 2, after the Geylang captain had raised the issue with his club, who then alerted the authorities.
Geylang's match against Harimau Muda went ahead as scheduled, with the Malaysians running out 2-0 winners.
Facing two charges, Kim was sentenced to 10 months in jail, while Jeon, who faced one charge of corruption, was given a 5-month sentence.
The maximum penalty for the offence was five years jail and S$100,000 fine.
The latest incident involving the Koreans comes after the suicide of former Suwon Bluewings player Lee Kyung-Hwan who had also been found guilty of match-fixing. Lee's death was the fourth related to a match-fixing scandal in the K-League.
Geylang meanwhile have now unfortunately found themselves in the news for the wrong reasons yet again, after the sudden departure of long-serving Chairman Patrick Ang before the season even began, and the sacking of coach Mike Wong early in the campaign.
The Bedok-based club sit at the bottom of the S.League table, level on points with Young Lions and Tanjong Pagar United.