This summer could see Manchester United keen to sign a left-back considering Luke Shaw and Tyrell Malacia cannot be relied on. For the past decade, Luke Shaw has been the left-back at Manchester United but during this time he’s missed more than 250 games through injury. When fit, there’s little debating his quality and status as one of the world’s best in his position, but this season, he’s barely been fit. He has made just 12 appearances in the league with a further two in the Champions League, and one in the FA Cup. This makes it one of his worst-ever seasons for injuries and a wake-up call …