Erik ten Hag promised he was a "fighter" after Manchester United slumped to a 3-0 Carabao Cup home defeat to Newcastle to pile more pressure on him. Defeat in the rematch of last season's final - which United won to highlight a promising first season in charge for the Dutchman - meant United have lost eight of their opening 15 fixtures in all competitions this term, their worst start since the 1962-63 campaign. Goals from Miguel Almiron, Lewis Hall and Joe Willock ensured a second consecutive 3-0 home defeat for United, comfortably beaten by rivals Manchester City on Sunday, and they were booed off at both half-time and full-time as Ten Hag was left facing some serious questions. "I am a fighter and I know it is not always going up," he said. "We have a lot of setbacks this season so far, but also you have to deal with it and that is never an excuse. "I have said that before I know when there are setbacks the routines are not the same, but even then you have to get results in. "Obviously, Sunday and tonight were far from that so we have to do things right and at a certain level, at the minimum level to win games." Questions of Ten Hag were already being asked after Sunday's derby defeat left United 11 points from the top of the Premier League table after 10 games. The former Ajax boss said he accepted that, but insisted he had no doubts about his own abilities. "I understand it when the results are not there," he said. "It is also a logical process that they are questioning that. But I am confident I can do it. At all my clubs I have done it and also last year here I did it as well, but at this moment we are in a bad place. "I take responsibility for it. I see it as a challenge. I am a fighter and I am in that fight and I have to make sure that I share the responsibility with my players and that we stick together and fight together, and get better results." Both sides made several changes from the weekend, but even with Newcastle's resources stretched by injuries they looked by far the sharper of the two sides, winning the midfield battles and finding space going forward, often far too easily down United's right-hand side in the first half. "It is below the standards everyone expect from Manchester United," Ten Hag said. "It is not good enough by far. We have to put it right. I take responsibility for it. It is my team and they are not performing. I have to share it with my players, but I am responsible." Australian Associated Press