Dutchman also claims that the Red Devils failed to play as a team.
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Manchester United manager Louis van Gaal has accepted the responsibility for his side’s defeat to Swansea City.
The 2-1 loss, which came courtesy of goals from Ki Sung-Yueng and Gylfi Sigurdsson, was United’s first opening-day defeat at home since 1972.
Van Gaal began the match with a 3-5-2 formation, but he switched to 4-4-1-1 at half time.
Speaking after the game, the Dutchman told BBC Sport: “It is very disappointing that we have lost our first home match.
“We didn’t reach the level we can play at. That is disappointing because we have done it much better and when you cannot do it in your first home match that is disappointing, especially for the fans.
“We were very nervous in first half, made the wrong choices and that is a pity. In the second half we never played as a team, therefore I’m responsible.
“We had more chances than Swansea but that shall say nothing about the result. It is the goals that count. I thought we would win [at 1-1] but because we are not playing as a team in the second half we made the wrong decisions going forward.
“My players did their utmost best, which I said in the dressing room, but you also need to play as a team and reach your level.”
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