On Saturday, June 14, the International Cricket Council, the sport’s global governing body, made a few changes to the 50-over format, also known as One-Day Internationals (ODIs). The two-ball rule, which will take effect on June 17, was one of the few rules that underwent a minor modification to the playing conditions.
In ODIs, teams have been bowling with two new balls for a quarter of 25 overs each since 2011. Larger scores were recorded as a result, and the batters gained an edge as reverse swing was eliminated. Before 2011, teams would bowl for 50 overs with just one ball. Only in the event that the ball was damaged were changes made.

Up until the 34th over of the ODI match, the ICC has now suggested adding two new balls. In order to finish the innings, the bowling side will have to choose which ball to use.
As far as an example is concerned, when there is an ODI being played between India and New Zealand, the ball on which bowling by India is going to happen is 1-17 and 18-34. Bowling side will have a choice after completion of 34 th over on which ball he/ she would prefer to continue either of two.
ICC also makes a change to how concussion sub-protocols will work

In addition to the two new ball rules, there is now a rule pertaining to substitutes for concussions. A batter, bowler, wicketkeeper, seamer, and a spin bowler are among the five substitutes that teams must identify prior to the match, according to the new regulation. If necessary, the player on this list will be substituted in for a concussion.
The ICC will implement all of these regulations on June 17. The first series to implement the restrictions will be the three-match ODI series between Bangladesh and Sri Lanka, which begins on July 2.