0409 GMT March 20, 2019
Mazzarri was tipped for the sack for some time and Mancini, who won three Scudetti and two Coppa Italia in a four-year spell at the Giuseppe Meazza, is set to replace the former Napoli tactician.
Respected football journalist Gianluca Di Marzio’s website reported that Inter president Erick Thohir has decided to replace Mazzarri with the former Manchester City and Galatasaray manager after a poor run of results, football-italia.net wrote.
It is claimed that Mancini will be given a two-and-a-half year contract and will take charge of Inter for the first time in six years for the Milan derby on November 23rd.
Italian football journalist Tancredi Palmeri later appeared to confirm the news on Twitter via no less a figure than Walter Zenga, who was apparently Mancini's only serious rival for the job.
Former Italy striker Mancini first took the Inter job in 2004, and was credited with making them the dominant team in Italian football after a 15-year spell without silverware.
But he was sacked by former Inter president Massimo Moratti at the end of the title-winning 2007-08 season, with a failure to achieve European success cited as the reason for bringing in Jose Mourinho.
While Mourinho brought Champions League glory to the Nerazzurri, his 2010 departure for Real Madrid precipitated a decline in the club's fortunes and new president Thohir feels Mancini is the man to restore Inter to the top table of Italian football.
Mazzarri, meanwhile, has struggled to translate his success as Napoli boss to Inter. Last season he took the club to fifth place, and this term they lie in mid-table, 12 points behind leaders Juventus after 11 matches.