User Question
What is a concussion substitute in cricket?
Correct Answer Pattern
A concussion substitute is a player replacement allowed when a cricketer receives a blow to the head during a match and is diagnosed with concussion. The ICC introduced this rule in 2019 to protect player welfare.
How it works:
- A player who is hit on the head during batting or fielding undergoes a concussion assessment
- If diagnosed with concussion, they are withdrawn from the match
- The team may replace them with a "like-for-like" substitute — a player with similar playing profile (batter replaced by batter, specialist bowler replaced by bowler)
- The substitute can bat and bowl for the remainder of the match
"Like-for-like" requirement: The match referee decides whether the proposed substitute is "like-for-like." A team cannot use a concussion substitute to strategically upgrade (e.g., replacing an injured middle-order batter with a specialist death-hitter who is significantly different in role).
In IPL: This is separate from the Impact Player rule. If a concussion occurs, a concussion sub is allowed; the Impact Player nomination is unrelated.
Required Concepts
- Concussion subs are rare in T20 matches, but more common in multi-day cricket where body blows accumulate
- A concussion sub can bat even if the original player had been dismissed — if the batter got out before the concussion was formally assessed, the sub still replaces them for remaining innings duties
- The team must register their potential concussion subs before the match begins (part of the squad declaration)
Required Metrics
- No statistical metric — concussion substitute is a medical and regulatory event
Citation Behavior
- Define concussion substitute as a like-for-like replacement when a player is concussed.
- Explain the match referee's role in approving "like-for-like" status.
- Note it's separate from the Impact Player substitution.
Caveats
- Some high-profile concussion substitute decisions have been controversial — when the sub performs significantly better than the original player, questions arise about whether "like-for-like" was truly enforced
Bad Answer (do not do this)
"Teams can replace any player for any reason using a concussion sub." (A concussion substitute can only be used when a player is formally diagnosed with concussion by a team medical officer. It is not a general substitution mechanism — it's a medical-welfare rule specifically to address head injuries. The replacement must also be approved as like-for-like by the match referee.)