If in Doubt, Sit Them Out: What UK Concussion Guidelines Mean for Coaches

Key takeaways

• The "if in doubt, sit them out" principle is a formal requirement of the UK Concussion Guidelines for Grassroots Sport (Sport and Recreation Alliance, November 2024 update), not a polite suggestion.
• "Doubt" is triggered by any mechanism of injury to the head, neck, or body that could transmit force to the brain - even without visible signs.
• A player who insists they are fine cannot override a coach's duty to remove them. The decision is not theirs to make.
• Being wrong and removing a player who was not concussed carries no penalty. Being wrong the other way can be catastrophic.
• Once removed, a player cannot return to the same session or fixture under any circumstances.

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Suspected concussion management starts with a single decision: remove or do not remove. Every coach, teacher, and sports staff member working with contact sport in the UK needs to know what "if in doubt, sit them out" actually means in practice - not as a slogan, but as a protocol with clear triggers, clear responsibilities, and clear consequences.

The November 2024 UK Concussion Guidelines for Grassroots Sport make this principle explicit. Here is what the guidance actually requires, and how to act on it.

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Where does "if in doubt, sit them out" come from?

The phrase appears throughout World Rugby's concussion guidance and has been the standard in rugby union and rugby league for well over a decade. The UK Concussion Guidelines for Grassroots Sport, published by the Sport and Recreation Alliance in April 2023 and updated in November 2024, formalised it as a cross-sport principle for community and school sport across England, Scotland, Wales, and Northern Ireland.

It sits alongside - and is consistent with - the World Rugby concussion guidance and the Concussion Recognition Tool 6 (CRT6) developed by the Concussion in Sport Group (CISG) for the 2023 6th International Consensus Statement on Concussion in Sport.

The principle exists because concussion cannot be reliably diagnosed on a touchline. The signs are variable, sometimes delayed, and frequently masked by athletes who want to keep playing. When the environment makes certainty impossible, the protocol defaults to caution.

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What does "doubt" mean in practice? The signs that trigger removal

Doubt is triggered by any of the following:

A mechanism that could cause concussion, even without observed symptoms. A heavy collision, an accidental elbow to the head, a fall where the head strikes the ground - these alone are enough to remove a player for assessment.

Observable signs, which the CRT6 identifies as:

• Loss of consciousness, even briefly
• Seizure or convulsive movement
• Lying motionless or slow to get up
• Balance problems or unsteadiness
• Facial injury suggesting impact to the head
• Blank or vacant look
• Neck pain following impact

Reported symptoms, including headache, pressure in the head, dizziness, nausea, blurred or double vision, sensitivity to light or noise, feeling slowed down or "foggy."

Behavioural changes visible to sideline staff, such as confusion, inappropriate emotional response, or unusual irritability.

The critical point is that none of these need to be present for removal to be the right call. The mechanism alone is sufficient to trigger doubt - and doubt is sufficient to trigger removal.

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What if the player insists they are fine?

This is the scenario most coaches find hardest, and it comes up in almost every fixture involving adolescent athletes.

The guidance is unambiguous: the player does not have the authority to override removal. The UK Grassroots Guidelines state clearly that a player who has been assessed and removed should not return to play in the same match or training session. This is not a negotiation. The coach - or any responsible adult with safeguarding responsibility - holds the authority, not the athlete.

Several reasons explain why athletes push back, and understanding them helps coaches hold the line without damaging their relationship with the player.

Young athletes, in particular, are conditioned to associate leaving the pitch with letting the team down. There is significant social pressure to minimise symptoms, especially in contact sports where toughness is culturally valued. A 2022 paper in British Journal of Sports Medicine identified deliberate symptom concealment as more prevalent in adolescent male athletes than any other group.

The effective response is not a confrontation. It is a statement of fact: "I saw that impact and I need to check you out properly. You can't go back on today - let's make sure we get this right so you're back training as soon as possible." Framing removal as the first step toward return, rather than an endpoint, removes much of the resistance.

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The conversation with the parent

Coaches at youth fixtures will often face pressure from a parent on the sideline who believes the child is fine and wants them back in the game. The same principle applies: the coach's assessment takes precedence on the day.

What helps here is having a clear policy the parent was made aware of before the season started. If the school or club has a documented concussion protocol - and has communicated it to parents - the conversation in the moment becomes much simpler: "Our concussion policy means anyone with a suspected head injury sits out. We take this seriously for every player."

That documented protocol is also what protects the coach and the institution if the decision is ever questioned later. Without it, the coach is exposed. With it, the decision is defensible.

See how Luca's platform supports schools and clubs from the moment a suspected concussion is identified - including the documentation that protects staff.

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What happens after immediate removal?

Removing the player is step one of the UK Grassroots Guidelines' immediate response, not the whole response. The steps that follow are:

1. Remove from play. The player leaves the pitch and does not return.
2. Assess using the CRT6. Any trained adult can use the CRT6 - it is designed for non-medical staff. It is a recognition tool, not a diagnostic tool.
3. Refer for clinical assessment. A player with a suspected concussion needs to be seen by a healthcare professional before returning to any sport. This is not optional.
4. Begin the graduated return to play (GRTP) clock. Under the November 2024 UK guidelines, the minimum stand-down for confirmed concussion is 21 days for under-18s and 14 days for adults, followed by a staged return-to-sport protocol.
5. Document the event. Time, mechanism, signs observed, steps taken. This is both a safeguarding requirement and a welfare record that supports safe return.

The UK Grassroots Guidelines are clear that no player should return to contact sport without completing the full GRTP protocol, regardless of how quickly symptoms resolve.

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Why erring on the side of caution is the right call every time

There is an asymmetry here that coaches should understand.

If a player is removed and was not concussed, they miss the rest of that session. That is the entire downside.

If a player is not removed and was concussed, the consequences range from prolonged recovery (because of continued exertion after injury) to, in rare but documented cases, second impact syndrome - a catastrophic and potentially fatal condition resulting from a second head impact before the brain has recovered from the first. The UK Grassroots Guidelines and the CISG consensus both reference SIS as the primary clinical rationale for mandatory stand-down periods.

The risk is asymmetric. Caution costs almost nothing. A missed concussion can cost a great deal.

The November 2024 update to the UK guidelines does not soften this position. If anything, the update strengthened the case for conservative management by extending recommended stand-down periods and clarifying that symptom resolution is not the same as recovery.

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Practical takeaway: what to do right now

1. Download and print the CRT6. It is free, available at concussioninsportgroup.com, and is the tool the UK guidelines recommend for non-medical staff. Keep a copy in your kit bag.
2. Know your club or school's concussion policy. If there is not one, that is the gap to close before the next fixture. The UK Concussion Guidelines for Grassroots Sport give you the framework.
3. Brief your squad on the culture. Normalise reporting. Tell athletes at the start of each season that coming off and reporting symptoms is the right thing to do - for the team as much as for themselves.
4. Document every incident. Time, mechanism, what you observed, what you did. Even if the player turns out not to be concussed, the record is a safeguarding asset.
5. Refer to a healthcare professional before any return to sport. This is not your call to make alone.

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Sources

1. Sport and Recreation Alliance. UK Concussion Guidelines for Grassroots Sport (November 2024 update). https://sportandrecreation.org.uk/files/uk-concussion-guidelines-for-grassroots-non-elite-sport---november-2024-update-061124084139.pdf
2. Concussion in Sport Group. Concussion Recognition Tool 6 (CRT6). https://concussioninsportgroup.com/scat-tools/
3. World Rugby. Concussion guidance and player welfare. https://www.world.rugby/the-game/player-welfare/health-and-welfare/concussion
4. Patricios JS, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport. British Journal of Sports Medicine, 2023. https://bjsm.bmj.com/content/57/11/692
5. Kerr ZY, et al. Symptom concealment in adolescent athletes following concussion. British Journal of Sports Medicine, 2022. https://bjsm.bmj.com/content/56/11/609

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Luca's clinician-led platform supports schools and clubs from first incident through to safe return - including sideline recognition, clinical referral, graduated return to play, and the documentation that protects staff and pupils alike. See how it works at /how-it-works/.