Ole Gunnar Solskjaer wants Manchester United to improve their concentration in order to get a positive result against Istanbul Basaksehir on Tuesday.
The Red Devils were stunned by a 2-1 loss in Turkey before the international break.
"Well you know when you go away to Turkey that it's going to be a difficult game anyway. I have experienced that at Manchester United a few times before, but the level of concentration needs to be better," Solskjaer told reporters before the game.
"We know two goals we conceded on bad breakaways and one or two other moments we caused our own problems with our own organisation when we had the ball.
"We need to be more disciplined in our positioning; any lack of concentration and they're off and running, the first goal was the worst goal to concede, the second a counter attack, and then we've looked at the game and how to break them down."