Concussion Substitute Rule in Cricket — ICC Law Explained
The ICC introduced concussion substitutes in 2019: if a player suffers a concussion during a match, a like-for-like replacement can play. Learn how the rule works, who approves it, and the controversies.
In August 2019, the ICC introduced the **concussion substitute** rule to protect player welfare. If a player suffers a concussion (or suspected concussion) during a match, the batting or fielding side can bring in a **like-for-like** replacement. It was the first formal replacement rule in cricket beyond the usual substitute fielder rules.
How the Concussion Substitute Rule Works
- **Medical assessment:** The team's doctor assesses the injured player and must conclude they have a suspected or confirmed concussion.
- **Approval by Match Referee:** The team nominates a replacement, but the **Match Referee** must approve the substitution — specifically checking whether the replacement is genuinely 'like-for-like' (similar skill set).
- **Like-for-like requirement:** The replacement should match the injured player's role. If a specialist batsman is concussed, the replacement should also be a batsman — not a bowler. The Match Referee has discretion over this judgment.
- **Full participation:** Unlike a substitute fielder (who can only field, not bat or bowl), a concussion substitute can bat, bowl, field, and keep wicket.
- **No return:** The concussed player cannot return to the match even if they later feel better.
The Steve Smith Case — First International Use
The first use of a concussion substitute in international cricket came in the 2019 Ashes series. Australia's **Steve Smith** was struck on the neck by a Jofra Archer bouncer at Lord's. He retired hurt, returned briefly, then experienced concussion symptoms. **Marnus Labuschagne** was approved as his concussion substitute — the first in Test history. Labuschagne went on to score 59 and 80 in the match, launching his international career.
Controversies
- **Like-for-like disputes:** The Match Referee's assessment of 'like-for-like' can be contentious. If a bowler is concussed, can a batting all-rounder replace them? The ICC guidelines are written but not exhaustive.
- **IPL use:** Concussion substitutes have been used more frequently in T20 leagues. Some instances have been questioned — cases where teams used the rule opportunistically to rotate players.
- **Feigning concussion:** The rule is policed by requiring genuine medical assessment, but critics argued early on that teams might be incentivised to exaggerate symptoms. No proven case of abuse has emerged in international cricket.
Frequently asked questions
Can a team choose any player from the squad as a concussion substitute?
No. The replacement must be like-for-like and must be approved by the Match Referee. If the Match Referee deems the proposed replacement is too strong an upgrade (e.g., replacing a tail-end batsman with the best batter in the squad), they can reject the nomination.
What was the rule before 2019?
Before the concussion substitute rule, a concussed player could only be replaced by a substitute fielder — someone who could field but not bat or bowl. This left teams seriously weakened if a key player was concussed.
Is the concussion substitute available in all international formats?
Yes — Tests, ODIs, and T20Is all use the concussion substitute rule under ICC playing conditions. Individual franchise leagues (IPL, BBL, etc.) may implement it under their own tournament rules, but almost all major T20 leagues have adopted the ICC template.