Davies may be champing at the bit, but O'Neill is under no pressure to make changes and will take a softly-softly approach with the former Albion captain.
The Villa boss said: "He's doing a wee bit. We have to ease him into it.
"He's been out for some time and the last thing we want to do is over-stretch him. But he's on his way back.
"He's feeling pretty good and obviously he's desperate to get started.
"But I'm looking things in the long-term, rather than one game coming up on Sunday."