The England and Wales Cricket Board (ECB) has made changes to laws to address players concussed on the field.
The new ruling for the 2018 season will mean that teams will be able to replace a player with concussion, or suspected concussion, so long as the new player is deemed a “like for like” replacement by match officials.
The new rule will apply in the County Championship, One-Day Cup, T20 Blast and Women's Super League.
The ECB says their research has shown "an average of around 15-20 incidents in first and second team cricket during each of the last few seasons".