The Milanese club have agreed to let the 24-year-old move to Anfield in a transfer worth 20 million euros (16 million pounds, $27 million), according to reports in England and Italy.
A Milan spokesman said he could not confirm any talks or deal. But the club's website reported that Balotelli had said his goodbyes to the Milan players and staff after training on Thursday morning, suggesting only personal terms remain to be finalised.
The move reflects Liverpool's determination to land a top quality replacement for Luis Suarez following the Uruguayan's World Cup biting disgrace and subsequent departure for Barcelona.
During Liverpool's tour of the United States earlier this month, Reds boss Brendan Rodgers had appeared to close the door on a move for Balotelli, saying: "I can categorically tell you that he will not be coming to Liverpool."
But with the close of the transfer window looming at the end of the month, it seems the Liverpool manager has had a change of heart over the pursuit of a player he has described as a rare talent.
Balotelli's two and a half years with Manchester City were overshadowed by his off-pitch antics, which included car crashes, setting fireworks off in his bathroom and an incident in which he threw a dart at a youth-team player.
He was regularly at loggerheads with then City boss Roberto Mancini and clashed with some team-mates while producing only intermittent flashes of his undoubted star quality.
Liverpool have reportedly targeted Monaco's Radamel Falcao as their first-choice replacement for Suarez but appear to have made little headway in their attempts to secure the Colombian, who missed the second half of last season and the World Cup with a serious knee injury.
A return to England and a fresh start could suit Balotelli. The striker has been subjected to criticism in his home country for a perceived poor attitude during Italy's World Cup campaign, which ended with the Azzurri flying home at the end of the group stage.
As the most prominent black player in Italy and the first to represent the country at a major tournament, Balotelli has also had to endure regular racist abuse of a kind which is now rare in English stadiums.
Balotelli was always a high-profile figure during his time in England, where he won both the Premier League and the FA Cup but also become a fixture in the gossip pages of the national press.
- Awkward character -
What Balotelli perceived as his unjust treatment led to a well-known goal celebration where, after scoring against local rivals Manchester United, he lifted his shirt to reveal a slogan saying 'Why Always Me?'
Balotteli eventually left for Milan in January 2013, Mancini having decided the time was right to cash in on his erratic forward.
Rodgers may feel he can do a better job of managing a striker with his best years theoretically ahead of him.
Suarez's caused Rodgers plenty of problems but the Northern Irishman was lauded for the way he was able to get the best out of his star striker, who scored 31 goals as the Reds narrowly missed out on the Premier League title last season.
Although Rodgers has already re-invested some of that money in signing a clutch of new players, he needs to strengthen a forward line that includes the England duo of Daniel Sturridge and Rickie Lambert, neither of whom can match Balotelli in terms of power and pace.
Balotelli scored 16 goals for Milan last season, as well as the winner in Italy's World Cup opener against England in Manaus.
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- Mario Balotelli
- AC Milan
- Luis Suarez