Brain injury charity Headway has called for stronger concussion protocol in football.
It follows what it's describing as a "concerning" incident with Manchester United centre-back Harry Maguire.
Maguire showed signs of discomfort after a collision in their Premier League match against Fulham but was allowed to continue after medical staff assessed him.
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Headway believes the introduction of temporary concussion substitutions are needed to add credibility to the assessment process.
