Fleming, the former New Zealand captain, has won four IPL titles with Chennai Super Kings and is widely regarded as one of the leading short-form coaches around the world. He attended the Hundred's inaugural draft in 2019 and was due to coach Trent Rockets, but stepped down ahead of the first season due to international travel restrictions and quarantine requirements.
It's understood that Fleming has agreed a deal with Brave for the 2023 season, which is likely to be announced next week.
New Zealand's international schedule is clear during the next two seasons of the Hundred and a number of their leading players are expected to be involved in the competition - particularly in 2023, with a white-ball tour of England scheduled immediately after the Hundred's conclusion in late August.
Adam Milne, James Neesham, Glenn Phillips and Ish Sodhi could all return, having appeared in the tournament's first two seasons, while the ECB will hope Trent Boult registered for the draft as a potential top-bracket signing.
Retention regulations for the 2023 season of the men's Hundred have not yet been released publicly, but it is understood that teams will have the option to retain a significant proportion of their squads from last season, as they did in 2022.
The fixtures for next season have not been announced, but according to a recent draft seen by ESPNcricinfo, Brave are set to play defending men's champions Rockets at Trent Bridge on the opening night on August 1, with their first home game against Welsh Fire on August 4. The final is due to be played on August 27.