The tweet's attached video showed an alleged "leaked" list of winners from the Recording Academy's website, and also claimed to have seen a fuller list of winners after a supposed hack of the site.
"There is no legitimacy to this," a spokesperson for the academy told Billboard. "Grammy Awards results are not shared, even with Recording Academy staff members, until the day of the Grammy Awards ceremony, when names of the recipients are delivered by [accounting firm] Deloitte in sealed envelopes."
The academy said it was reaching out to its legal team to seek advice on potential legal action.
The official Grammy Awards winners will be announced at the 61st annual ceremony, which takes place live at the Staples Center in Los Angeles on Sunday 10 February at 8pm.
More about: Grammys2019