Concussion Substitutes in Cricket Explained
How concussion replacements work in international cricket: when they apply, who approves them, the like-for-like principle and why they were introduced.
Cricket is a contact sport in many respects. A hard ball travelling at high speed can strike a batter on the helmet, and fielders can collide when chasing a catch. Concern about head injuries has grown across many sports, and cricket has responded with rules that allow teams to replace a player who has suffered a suspected concussion. These are known as concussion substitutes.
Why the rule was introduced
Before the change, a team that lost a player to injury during a match simply played with fewer players or used a substitute fielder who could not bat or bowl. That created pressure for a player to continue after a head blow because the team would otherwise be disadvantaged. The aim of the concussion rule was to remove that pressure and to put player welfare first.
The International Cricket Council introduced like-for-like concussion replacements in international cricket in 2019. The first use in a Test match came in the Ashes at Lord’s in August 2019, when Marnus Labuschagne replaced Steve Smith after Smith was struck by a bouncer from Jofra Archer and was later ruled out of the match. Domestic competitions in several countries had also adopted similar systems around the same time.
How the process works
The procedure follows a series of steps, although exact details depend on the competition’s regulations:
- A player suffers a blow to the head or shows symptoms of concussion during the match
- The team doctor or medical staff assess the player and can recommend a replacement
- The team requests a substitute from the match referee
- The match referee decides whether the request meets the rules and approves the replacement
- The replaced player does not return to the game
The decision about whether a replacement is made is based on medical judgement, so the match referee relies on the team’s doctor’s assessment rather than on tactical considerations. Players who show delayed symptoms can also be replaced after the event if the medical team believes that concussion has taken place.
The like-for-like principle
A key aspect of the rule is that the substitute must be a like-for-like replacement. A batter is normally replaced by a batter, a fast bowler by a fast bowler, and so on. The match referee has the power to decide what counts as like-for-like and may refuse a request if the proposed substitute would give the team an unfair advantage. Players named in the squad and part of the match-day group are generally eligible, subject to the competition’s rules.
There are some cases that raise questions. A wicketkeeper’s replacement, for instance, must be able to perform that role. An all-rounder may be replaced by a player with a similar skill set, but the referee is expected to consider whether the swap is fair.
Return to play and wider protocols
Concussion is taken seriously beyond the match itself. Many cricket boards follow return-to-play protocols that require a gradual increase in activity and clearance from a doctor before a player can resume training or competition. The rules differ between countries, but all are designed to reduce the chance of a player returning too early and suffering further damage.
Equipment has also developed. Helmets now meet safety standards that specify the protection of the neck and face, and many batters wear them against both fast and spin bowling. Coaches at all levels teach safe techniques for dealing with short-pitched bowling and for fielding close to the wicket.
Debate and refinement
The rule has been discussed in the cricket community. Some commentators have asked whether teams might exploit it, and the match referee’s role as gatekeeper is meant to prevent that. Others have pointed out that concussion can be hard to diagnose quickly, which makes clear protocols essential. The rule continues to be reviewed as medical knowledge improves.
Key points
Concussion substitutes recognise that a player’s long-term health matters more than the result of a single match. By allowing like-for-like replacements, the game aims to remove the incentive to play on after a head injury, while the match referee’s oversight keeps the system fair.
Frequently asked questions
When did concussion substitutes begin in international cricket?
The International Cricket Council introduced like-for-like concussion replacements in 2019, and the first Test use was at Lord’s in the Ashes that year.
Who decides whether a concussion substitute is allowed?
The match referee approves the request, based on the assessment of the team’s medical staff, and decides whether the replacement is like-for-like.
Can the concussed player return to the match?
No. Once a player has been replaced, they cannot return to that match.