Inzaghi has been missing since last year due to a serious knee injury.
"I'll be back in 20 days to help Milan win," he told Sport Mediaset on Monday evening.
"I'm feeling reasonably good. My knee is no longer causing me problems. I think I'll be available in about three weeks, but only if I'm 100 per cent fit.
"I suffered a serious injury and you can't mess around with these things. In the past after injuries I returned too soon.
"My future? If I heal properly then I'd like to play on for one more season here and then end my career with Milan."