The Brazilian club had been forced to rebuff rumours that the 24-year-old was primed to join the Red Devils, insisting he would not leave the club in January.
But now Ribeiro has fuelled speculation by sharing his admiration for the Premier League champions and suggesting he would be a perfect fit for the United midfield.
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"I feel I am ready to play in any part of the world. If you play for Cruzeiro, you can play in any place.
"United have [Shinji] Kagawa, [Wayne] Rooney, [David] De Gea is the goalkeeper. I know them very well because I play with them a lot in video games as they are a great team. You play it one day after the other and know the players even better.
"I would fit in any part of the midfield. I would do well as a playmaker to support the attack.
"I let my agent and Cruzeiro talk about that. When they feel it's good for both parties, they will let me know. I'll see and we'll analyse everything."
Ribeiro, who is likely to command a price of around £15 million, added to Gazeta Esportiva: "There is always speculation after a great performance in a competition, but I am a Cruzeiro player.
"I'll rest a lot, enjoy the holidays with my family and return fully charged in January. I let Cruzeiro and my agent handle the negotiations."