Villa boss O'Neill wants Liverpool's Carson permanently
Carson, 21, admitted spending last season at Charlton increased his "hunger" to go out on loan again.
"I had some concerns when I came back from pre-season that I wasn't going to play many games for Liverpool and I asked the boss if he would consider letting me go out on loan," he said. "At the time he said, 'I can't because I haven't got another keeper'. I've got to thank him because he's worked to find a replacement to give me this opportunity."