As first reported by the Manchester Evening News, the 24-year-old midfielder confirmed that there has been no concrete offer.
He's been heavily linked with a move to Manchester United, with Old Trafford boss David Moyes believed to be keen to strengthen his squad in the January transfer window.
But Ribeiro said: "I can't say that I'm leaving if nothing concrete comes up.
"My focus is here in Cruzeiro. The Libertadores is already knocking on our door, we have to be well prepared for this competition."
Recent reports have suggested Cruzeiro could do business with United for £15m, but it remains to be seen whether Moyes will move for the South American ace.
The United boss is under pressure to make additions this month following a less than impressive start to his reign as Sir Alex Ferguson's replacement.
The defending Premier League champions currently sit down in seventh place, and face a battle even to qualify for next year's Champions League competition.
Central midfield has been cited as a United weakness by many, and while injuries have not helped the United boss, there's a feeling he needs to bring in new faces to improve the squad.
Ribeiro said earlier this season that he'd favour a move to Manchester United over Real Madrid.
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