But Ballack said: "It's getting better, I keep going with my rehab programme, I can train outside and I am quite happy now with the way we work.
"I work very hard and I hope that I can come back soon," he told Chelsea TV.
Ballack has been running in a sandpit to try to hasten his recovery rate but admits it is tough going.
He added: "It is very hard for the condition but it is good for the foot so it is part of my programme now.
"It is much better; I had to wait a long time to be at this level now, so I am happy. I hope in a few weeks I will be back on the pitch, I can train with the team and also be playing."