Louis van Gaal
Van Gaal suffered defeat in his first game as United boss.Getty Images/Alex Livesey

Manchester United manager Louis van Gaal will not react to the opening day defeat to Swansea City by making significant moves in the remaining two weeks in the summer transfer window.

United suffered their first opening day defeat at Old Trafford since 1972 as goals from Ki-Sung-Yueng and Gylfi Sigurdsson gave Garry Monk's side a shock win.

Captain Wayne Rooney had equalised for United in the second half but the home side were unable to level for a second time as they ran out of ideas and Van Gaal said his side were unable to reach their potential.

"We don't reach our level that we have showed in the past matches and that was disappointing," he told BT Sport. "We are disappointed in ourselves and that is why we lost today."

United had only made two signings in the summer transfer window in Ander Herrera and Luke Shaw, who was one of nine players missing for the first game of the season.

Van Gaal was forced into handing youngsters Jesse Lingard and Kyle Blackett their first starts for United such was the extent of the injury crisis but the former Netherlands coach will not delve into the transfer market to bolster his squad.

"That [signing players in the transfer market] is short term," the 62 year old said. "I think of course we need defenders but that I have already said but you cannot say because of one game. We never played as a team and that is our error and we don't reach the level and because of that. We have to play like a team.

"Chances are not enough you have to make the chances. The main reason is we are not reaching our level and we have to evaluate why. They have done their upmost best because you have seen a second half they have run miles and miles. I think we have to keep our heads up and ensure the second step in our process is better than we have done today."

Though the club are being hindered by a series of injuries, with the likes of Robin van Persie and Michael Carrick both out, Van Gaal is ready to inform several United players they will not feature in his plans this season, but they will not be forced to leave.

"No [I will not tell them to leave] because I don't think it's up to me and the players to decide because we have given the contract to the players," he added. "I shall tell the players what I think and I shall never say you have to go."