Cape Town - Manchester United manager Louis van Gaal insists he was right to start Luke Shaw at the Emirates Stadium.
Shaw was replaced by Ashley Young after 15 minutes in north London after a challenge by former Southampton team-mate Alex Oxlade-Chamberlain.
“I am convinced that I made the right decision,” van Gaal explained to manutd.com.
“This is the life of a manager, the result is always giving you the reason or not [to pick these players]. I cannot do other things because I don't have so many players.
“Shaw has come back from internationals not fit enough so we made him fit, but then he gets injured again. Then I have to give Young a game but Young is not fit enough to play 90 minutes. I have said this before. Then I have to change the line-up again.
“I think the players have done fantastic. Tyler Blackett, Paddy McNair and Luke Shaw, how old are they? So when you play against a team like Arsenal, a team that are always changing position, you have to have communication. I think that is pretty good, but I was not pleased with the overall performance.”