Substitute Fielder Explained: Rules for Replacement Fielders in Cricket
How substitute fielders work in cricket — when a fielder can be replaced, what substitute fielders can and cannot do, and the rules around concussion substitutes introduced in recent years.
A substitute fielder in cricket is a player who fields in place of a regular member of the fielding team — typically when a player is injured, ill, or otherwise temporarily unable to field. Substitute fielders are governed by specific Laws of Cricket rules: they can field but have specific restrictions on what actions they can take during the match.
What Substitute Fielders Can and Cannot Do
A substitute fielder CAN: field anywhere in the field, including as wicketkeeper (if specifically approved by the umpires as a wicketkeeper substitute); take catches; effect run-outs. A substitute fielder CANNOT: bat (batting must be done by the players listed in the original XI); bowl; act as wicketkeeper without specific approval; or captain the team. This restriction means a substitute can help save runs and take catches in the field, but cannot contribute to the match offensively (batting) or to the bowling attack.
When Substitutes Are Allowed
Substitute fielders are allowed when a player is injured or ill during play — not for tactical reasons or simply because a team wants a specialist fielder to replace a bowler in the outfield. The umpires must approve the use of a substitute and the reason must be legitimate injury or illness. If a team uses substitute fielders persistently for fit players (as a tactical rotation), the umpires can disallow it. In practice, substitutes are most commonly used for players who are injured on-field (twisted ankle, collision injury) and need assessment before returning to play.
Tactical Considerations
The substitute fielder rules have been subject to debate — particularly around 'strategic breaks' where players are allowed off the field for treatment that is arguably not urgent, enabling a team to use a specialist substitute fielder in their place. Umpires are empowered to use judgement when they suspect substitute fielding is being used tactically rather than for genuine injury, and match referees can investigate if teams appear to exploit the rule. The concussion substitute rule adds a new layer: teams must genuinely have a player with concussion symptoms assessed by a team doctor, with the match referee approving the like-for-like replacement.
Frequently asked questions
What can a substitute fielder do in cricket?
Field anywhere (including as wicketkeeper if approved), take catches, and effect run-outs. A substitute fielder CANNOT bat, bowl, or captain the team. Substitute fielding is only allowed for genuine injury or illness — not for tactical reasons.
What is a concussion substitute in cricket?
A rule introduced by the ICC in 2019 — if a player suffers a confirmed concussion, they can be replaced by a 'like-for-like' substitute who can bat, bowl, and keep wicket (not just field). The replacement must be approved by the match referee after assessment by the team doctor. The first notable use was Steve Smith replaced by Marnus Labuschagne in the 2019 Ashes.
When is a substitute fielder NOT allowed?
When the reason is tactical rather than injury/illness — umpires can disallow substitutes if they suspect the fielder is fit and the team is using a specialist sub for tactical advantage. Substitute fielding is specifically for players temporarily unable to field due to genuine injury, not for rotation or strategic purposes.