Police reported the “sudden deaths” of the two men at a property in the Elms Park area of Coleraine on Monday afternoon 29 Novmeber.
Police said they attended the scene, along with other emergency services, and are satisfied that there is “no immediate risk to the public”.
The PSNI also said the deaths are “not being treated as suspicious at this time”.
The cause of death has not yet been made public.
PUP Councillor Russell Watton said the two men were “great friends” who had been planning to attend a Rangers match in Scotland this weekend.
UUP Cllr Darryl Wilson said he was “deeply saddened” to learn of the deaths and offered his “deepest sympathies to all impacted by this tragedy”.
SDLP East Londonderry MLA Cara Hunter expressed her shock after the deaths.
“My condolences go out to their families and friends at this very difficult time,” she said. “The local community will be stunned following this incident and my thoughts also go out to them after this distressing ordeal.
“I would ask that people give the police space to carry out their investigation into these sudden deaths so they can establish exactly what took place here. I would also encourage anyone with information about what took place to come forward to the police as soon as possible.”
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