Davies said: "This is a great club and I am delighted to be here and I want to repay the faith shown in me by Martin O'Neill with my performances on the park.
"The manager's record speaks for itself. He has turned players like Muzzy Izzet, Emile Heskey and Robbie Savage into great players and hopefully I can be one of those players who goes the same way.
"This is a great squad of young and hungry players and I wan to play my full part. It's great that I am going to get the chance to make my debut.
"I think the manager would be happy that I am impatient to get into his first XI because if players don't have that attitude then they don't deserve to play.
"I have been a regular player wherever I've played and I hope sooner or later to be the same at Villa. I'd certainly like to give him a headache for the Tottenham game.
"If I can do as well as I know I can, then hopefully it will be a very hard decision for him. I am chomping at the bit to do well."
Martin O'Neill confirmed: "Curtis will play. He is recovered from his hamstring injury and I want to see him in action. He is raring to go and wants to do well.
"We were delighted to finally get him after chasing him for much of the summer and we have got good competition at the back for places now."