The Red Devils headed into the game having had Wayne Rooney ruled out for a number of weeks due to a knee problem, and lost David De Gea to an injury in the warm-up in Denmark.
In certain phases we were not very well organised
Louis van Gaal
United took the lead through Memphis Depay’s opener in the 37th minute.
But home side drew level through Pione Sisto in the 44th minute, before Paul Onuachu hit the winner 13 minutes from time to heap further misery on Van Gaal, whose side headed into the game on the back of their 2-1 loss to Sunderland at the weekend.
Speaking to BT Sport after the game, Van Gaal said: “It is the law of Murphy, I think! When you start a game and your goalkeeper is number 14 [on the injury list] then you are not starting like usual.
“A lot of things are happening in the heads of the players.
“The first goal is deflected, it is unbelievable, it is too much. In the second half we don’t win any duels. Any second balls. Then you cannot afford a second goal. Jesse Lingard had two remarkable chances.
“In certain phases we were not very well organised.
“When you play with another team every week with other players it doesn’t help. It is always possible in football. We have the chance to beat them at home and we have to do that.”
United now turn their attentions towards their FA Cup fifth-round clash with Shrewsbury Town on Monday night.
MORE: The latest football news