The Brazilian playmaker, as well as former Liverpool and Chelsea midfielder Yossi Benayoun, are two names that the Red Bulls are reportedly showing interest in but Roxburgh insists that the New York outfit are keeping their options open.
"We were open-minded about that," said Roxburgh after a recent meeting with Red Bull owner Dietrich Mateschitz. "We're entirely open-minded.
"We know we need it to be somebody appropriate. It's not a matter of just saying 'Oh, let's go get the next one.'
"It's a matter of what's appropriate. Once we're specific about it, then we'll discuss that.
"We're looking at everything in a balanced way. We inherited a squad of players put together by different elements. For me that's the one thing I was able to say to the owner: After watching making judgments I'm far more aware if what we've got and what we need.
"Now, knowing what we need and acquiring what we need are two different things. But we're far better equipped to know what we need."