Ganguly, whose brother Snehasish tested positive for the disease a little over a week ago, was in home quarantine since then.
"He is living with his ailing mother and family, so as a precautionary measure he took the test voluntarily and the report came negative on Friday evening," a source close to the former India captain told PTI.
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Meanwhile, Snehasish, who currently holds the post of secretary at the Cricket Association of Bengal, will be discharged from hospital in a couple of days.
"He is doing fine and also handling office work from the hospital through virtual meetings. We expect him
Earlier, his entire family - wife, in-laws and their domestic help - had tested positive for the virus on June 20. Snehasish then shifted base from his residence in Mominpur to Behala where his brother, Sourav, is based.