The Brazil striker missed their 5-1 thrashing by Cagliari due to injury.
Adriano said: “It won't be long until I'm back and when I return I'll be 100 per cent.
“I feel good. I am recovering one step at a time. I am doing fitness work after my physiotherapy. I have spoken with the doctor and the coach and they want me to get back into peak condition.
“It might take a couple of weeks depending on what I feel like.”