CHRIS SUTTON: Football’s trial with concussion substitutes fell at the first hurdle when Issa Diop played on after nasty clash with Anthony Martial… this was a first sobering lesson learned 

CHRIS SUTTON – COMMENT: This trial had a stinker on Tuesday night when Issa Diop was allowed to play on. Lawmakers IFAB must look at this and realise why it’s so wrong, so perverse.