It’s been two years since goal line assistant referees – those blokes that stand on the byline on one side of the goal like the kid in school who isn’t allowed to join in – were first trialled in the Europa League. It’s a testament to their complete ineffectiveness that we didn’t even notice their assimilation into Champions League fixtures until Danny Welbeck argued with one on Tuesday night. The reason for this argument? Not a penalty decision, or an incorrectly awarded goal kick. The ball went out of play by a fraction. Or did it? Apparently, by virtue of being right next to the ball, the human eye is impervious to slight of foot and fractional error. Yeah, right.