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It's comes under "serious foul play" (which is a sending off offence), although it will be the ref's discretion as it's entirely subjective.
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SERIOUS FOUL PLAYA tackle or challenge that endangers the safety of an opponent or uses excessive force or brutality must be sanctioned as serious foul play.
"(I haven't seen the video of the tackle in question, just answering the question posed...)
Is it classed as reckless when a serious injury happens? Like that Ukraine one in the Euros.