The ICC has also ruled that all players will be fined if their side is guilty of a slow-over rate and that trials will begin to see whether replays should be used to call no balls
The ICC has announced that concussion player replacements are to be introduced into all formats of men's and women's internationals and for first-class cricket worldwide from next month.
The debate of using concussion substitutes has intensified over the last couple of months after Hashim Amla and Hashmatullah Shahidi were just two of the players requiring medical assistance after being struck on the head at the World Cup.
Amla did go off the field following a Jofra Archer delivery before appearing later on in the opening game of the tournament between England and his South Africa side, while Afghanistan's Shahidi ignored medical advice to leave the field and continued to play after being hit by Mark Wood's vicious bouncer.
The ICC statement said: "Following a two-year trial of concussion replacements in domestic cricket, the ICC approved concussion player replacements in all formats of men's and women's international cricket and for first-class cricket worldwide.
Hashmatullah Shahidi ignored medical advice to leave the field
"This will be included in ICC playing conditions from August 1, 2019. Decisions on replacements will continue to be made by the team medical representative and the player should be a like-for-like replacement who will need to be approved by the match referee."
The ICC has also ruled that all players of a fielding side guilty of a slow-over rate will be fined at the same level as the captain, who themselves will no longer be suspended for repeated or serious over-rate breaches.
In terms of the World Test Championship matches, they state that a team that is behind the required over rate at the end of a match will have two competition points deducted for each over it is behind.
The ICC also endorsed the Cricket Committee recommendation that replays may be used to call no balls in the future, and trials will be conducted over the coming months.
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