Concussion Substitute Rule in Cricket Explained
Cricket's concussion substitute allows a team to replace a player who suffers a concussion during a match — learn how the rule works and when it applies.
What Is the Concussion Substitute Rule?
Introduced by the ICC in 2019, the concussion substitute rule allows a team to replace a player who has been diagnosed with a concussion during a match with a 'like-for-like' substitute. It was created to protect player safety and ensure concussed players do not feel pressured to continue playing.
How It Works
If a player suffers a suspected concussion — whether from a blow to the head from a ball, helmet impact, or collision — the team doctor assesses them. If concussion is confirmed or suspected, the team can apply to the match referee for a replacement. The replacement must be a like-for-like substitute — broadly similar in role.
Who Approves the Replacement?
The match referee makes the final decision on whether the concussion substitute is approved and whether the proposed replacement is sufficiently like-for-like. The team nominates a replacement player from the squad, but the referee can reject the nominee if they believe they offer a significant competitive advantage.
What Can the Substitute Do?
A concussion substitute can bat, bowl, and field — unlike a normal substitute fielder who can only field. This is the key distinction. The substitute has full playing rights for the rest of the match, exactly as the original player would have had.
Notable Uses
Steve Smith was replaced by Marnus Labuschagne in the 2019 Ashes Test after being struck by a Jofra Archer bouncer — the first instance of a concussion substitute in Test cricket. Labuschagne went on to score runs in that match and subsequently became Australia's top Test batter, though the concussion substitute had no connection to his subsequent success.
Controversies
- Critics argue that 'like-for-like' is inherently subjective — one player is never exactly equivalent to another
- Accusations of tactical use have occasionally surfaced, though no case has been proven
- The rule places significant trust in team doctors who may feel pressure from team management
- In some cases, the replacement has performed better than the original player would have, raising fairness questions
Frequently asked questions
Can a concussion substitute be used more than once in a match?
No. Once a concussion substitute is on the field, only one replacement is permitted per incident. A team cannot chain multiple substitutions from a single injury.
Does the concussion substitute rule apply in all formats?
Yes. The ICC implemented it across Test, ODI, and T20 International cricket simultaneously in 2019. Most domestic boards have also adopted equivalent rules.
What if both teams have concussion cases in the same match?
Each team's case is assessed independently. Both sides can have concussion substitutes simultaneously — there is no limit to one per match at the team level.