The International Cricket Council have confirmed that a series of amendments to playing conditions will take effect from tomorrow.
The ICC chief executives' committee ratified a number of proposals when they met at the end of June and all future Tests and one-day internationals will now be played under the revised laws.
The practice of players leaving the field for 'comfort breaks' to be replaced by substitute fielders has been legislated against, with clause two of the game's playing conditions explicitly stating that such reasons do not represent "wholly acceptable" justification.
Additionally, all catches can now be referred to the third umpire when the on-field officials are unsure as to the validity of an appeal.
The amended wording on disputed catches now reads:
"Should both umpires be unable to make a decision, they may consult by two-way radio with the third umpire as to whether there is any definitive evidence as to whether the catch was taken cleanly or not. Following such consultation, the final decision will be made and given by the bowler's-end umpire."
One-day captains have been handed another tactical decision to make, with one of the two options power-plays - periods of five overs when fielding restrictions are applied - to be picked by the batting side.
Current rules have a 10-over enforced power-play, with the fielding captain choosing the timing of the next two.
Another change that was brought about at the ICC meeting involved handing the umpires the chance to reduce the interval between innings when the game has been delayed or interrupted was introduced with immediate effect in June.
An ICC statement read:
"These amendments, which were unanimously approved by all 10 full members and the three associate member representatives on the CEC at its meeting at the end of June, are designed to improve the game for players, umpires and spectators."