The England and Wales Cricket Board plan on introducing a new format of the game where each team faces 100 balls as part of a revamped domestic competition.

The proposed format for the new eight-team tournament would see each team facing 15 six-ball overs as well as another 10 deliveries to make up a total of 100 balls.

It is not clear at what point in an innings the extra 10 deliveries will be bowled, or whether they will be bowled by one bowler or more.

Southampton, Birmingham, Leeds, London, Manchester, Cardiff and Nottingham have been confirmed as venues for the new five-week competition, which starts in 2020.

The new tournament will run alongside the existing county structure, which includes four-day, 50-over and 20-over competitions.

Each franchise will have a men’s and a women’s team.