Erik ten Hag has claimed he was warned against the Manchester United job, as it was an “impossible” task. The Dutchman won the Carabao Cuo in his first campaign, but has faced a turbulent start to his second season. United have suffered six defeats in their opening 15 Premier League games. They also face a difficult task to qualify for the Champions League knockout stages with one group game remaining. “Everyone was telling me, ‘you can’t succeed in that job’. They said it was impossible. Me? I wanted the challenge. “I knew it wouldn’t be easy, but it was such a great club with such a great fa…