Play • 28 min

In 2016, a US appeals court upheld a $1bn (£700m) settlement between the NFL and a group of retired players who had suffered brain damage as a result of concussions.

Since then, says NFL chief medical officer Dr Allen Sills, the organisation has instilled a "very aggressive programme to try and reduce those injuries".

In fact, Sills says, the league was able to "reduce concussions by 29%" last year.

NFL protocols mean each player gets the same exam whenever they are evaluated for a head injury - anyone deemed to have suffered a concussion cannot return to the field.

The tests, carried out in a pitch-side tent, include a set of simple questions about the game, the location or the player's team, while medics assess the player's eye movement, speech and behaviour.

Now, the Premier League and other leagues around the world are looking at what they can learn from the NFL.





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