It also gives almost no chance to an attacking player. If this was done anywhere on the field apart from the touchline it would be given as obvious obstruction. And no I don't mean just shielding the ball out of play or a show of strength I mean obvious obstruction. That said you see it a little less these days.
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For an average height guy Alex Sandro's is pretty special though, great centre of balance.
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Not needed, we have Mirezine Pjadane as AM