Concussion Substitute Rule in Cricket: When and How It Applies
The concussion substitute rule was introduced by the ICC in 2019, allowing a player who suffers a concussion during a match to be replaced by a like-for-like substitute who can bat, bowl, and field in the match. Previously, an injured player could be replaced only for fielding — the replacement could not bat or bowl. The concussion substitute rule created new tactical complexities and has been used controversially in high-profile matches.
The concussion substitute rule: ICC introduced the concussion substitute rule in August 2019, following increasing medical awareness about the dangers of concussion in sport. The rule: if a player suffers a concussion during a match (either from a blow to the head from the ball, or other head/neck injury), a team can apply to the match referee to use a concussion replacement player. The replacement player must be 'like-for-like' — broadly similar in function to the replaced player (a batsman replaced by a batsman; an all-rounder replaced by an all-rounder). The match referee approves the replacement based on the team's submission of medical evidence and the proposed replacement player's profile.
Like-for-Like Requirement
Like-for-like definition controversy: the 'like-for-like' requirement is the most contested aspect of the concussion substitute rule. When Australia replaced Steve Smith with Marnus Labuschagne in the second Ashes Test (2019 — the first use of the concussion substitute rule in Test cricket), England challenged whether Labuschagne was truly like-for-like to Smith. At the time, Labuschagne was primarily known as a solid first-class batsman; Smith was the world's number-one Test batsman. The match referee approved the substitution. Labuschagne then scored 59 and 80 as a concussion substitute — his performance effectively ended England's chance of winning the match. He went on to become one of the best Test batsmen in the world (reaching number 2 in world Test rankings), making this the most consequential concussion substitute in cricket history.
Process for Applying
How to apply for a concussion substitute: the process for applying for a concussion substitute: (1) the team's medical officer assesses the injured player and determines they have a concussion (using the Cricket Concussion Recognition Tool or equivalent protocol); (2) the team notifies the match referee and provides: the injured player's name; the proposed substitute's name and a summary of why they are like-for-like; the medical officer's report confirming the concussion diagnosis; (3) the match referee reviews the submission and decides whether to approve. If approved, the substitute may immediately bat, bowl, and field for the rest of the match. The injured player does not return once the substitute is approved. In T20 cricket, the limited match duration means concussion substitutes are less commonly approved — the medical assessment timeline can take long enough that the match effectively progresses past the point where the substitute would be needed.
Safety Rationale
Why the concussion substitute rule was introduced: before the 2019 rule, a concussed player could only be replaced by a fielding substitute — the replacement could not bat or bowl. This created perverse incentives: teams were pressured to return a concussed player to the field to bat or bowl, because not doing so significantly disadvantaged the team. The concussion substitute rule removes this pressure — a player can be safely removed from the match without the team being disadvantaged by having to use the injured player despite medical advice. The rule specifically addresses cricket's unique exposure to head injuries from fast bowling — a 90 mph delivery hitting a batsman's head is a genuine risk at the highest level, and the frequency of such incidents in the modern game (with pace bowling speeds increasing) made a specific rule essential. The ICC continues to review and refine the concussion substitute protocol based on how it has been applied in practice.
Frequently asked questions
What is a concussion substitute in cricket?
A concussion substitute in cricket is a replacement player who can bat, bowl, and field in place of a player who suffers a concussion during a match. The ICC introduced the concussion substitute rule in 2019. Under the rule, if a player is assessed as having a concussion by the team's medical officer, the team can apply to the match referee to use a replacement player for the rest of the match. The replacement must be 'like-for-like' (broadly similar in function — a batsman replaced by a batsman, a bowler replaced by a bowler). Unlike an ordinary injury substitute (who can only field, not bat or bowl), a concussion substitute has full playing rights. The first use of the concussion substitute in Test cricket was Australia's Marnus Labuschagne replacing Steve Smith in the 2019 Ashes at Lord's.
How was the concussion substitute rule first used in Test cricket?
The concussion substitute rule was first used in Test cricket in the second Ashes Test at Lord's, August 2019. Steve Smith was struck on the neck by a Jofra Archer delivery and suffered a concussion. He was taken off the field and assessed by the team's medical officer, who confirmed the concussion diagnosis. Australia applied to the match referee (Chris Broad) to use Marnus Labuschagne as a concussion substitute. The match referee approved the substitution, accepting that Labuschagne was like-for-like to Smith as a top-order batsman. Labuschagne scored 59 in his first innings as a substitute and 80 in the second innings, making a significant contribution to Australia's performance. The substitution became famous not only for being the first Test concussion substitute but because Labuschagne went on to become one of Australia's best Test batsmen.
Can a concussion substitute bowl in cricket?
Yes — a concussion substitute in cricket can bat, bowl, and field for the rest of the match (unlike an ordinary fielding substitute, who can only field). The concussion substitute has full playing rights for the remainder of the match, subject to the match referee's approval. The specific bowling role depends on the 'like-for-like' approval: if the replaced player was a non-bowling batsman, the concussion substitute cannot bowl (because bowling would not be like-for-like). If the replaced player was an all-rounder or a bowling all-rounder, a bowling replacement may be approved. The match referee has discretion in assessing whether the proposed substitute is genuinely like-for-like, particularly regarding bowling ability. Teams occasionally submit all-rounder replacements for specialist batsmen — which the match referee may or may not approve depending on the specific comparison.