Crickinfo reported:
"I'm fit and refreshed and felt I could have gone flat out a month ago, but I've had to be patient," Lee told The Sunday Telegraph.
"Now I'm back running flat out and felt like I was bowling at full pace again. As each session has gone on I've got quicker and quicker. I'm back to bowling where I finished up before the injury."
Keenly aware, however, that the retirement of Glenn McGrath has increased the focus and burden on him, Lee said: "But I don't want to be like I was six months ago, I want to keep improving and become a better player."