Thin-skinned Lisandro Martinez has exposed the insidious, destructive lack of accountability that's threatening to rip apart the Man United dressing room

Lisandro Martinez had one job to do in the 92nd minute of Manchester United ’s game against Tottenham at the weekend. Had he done it, United would have won a big Premier League game and, despite their uncertain start to the season, would currently sit only two points outside the Champions League places. Had he done it, United would have travelled to Madrid for a tough European game yesterday in better spirits and with more confidence and with less noise around them.