Speaking on Alejandro Garnacho, Erik ten Hag said: "He was on the bench, then, of course, he is capable of playing.
"But we also had other options with Martial, with Jadon Sancho, with Sabitzer, offensive and fit - very fit - players are there and present, then you have to play them.
"But in one week, you have to see, it's one week extra and he is brave, he can make a difference, yeah.
"You have seen we tried to change them but that's always difficult when you are losing. You saw the team wanted, they put a lot of effort in and on occasions, they go in the wrong positions, they are forcing too much, too quickly, then it's counterproductive.
"So we have to learn from such situations, stay calm, stay composed, then you create chances. We had some chances, the best I think was Martial but we have to create more."
Garnacho returned to the United squad for the first time in seven weeks and, despite his game-changing prowess off the bench, Ten Hag turned to five other substitutes in an attempt to salvage the game.
Anthony Martial was introduced for Wout Weghorst before the hour before Jadon Sancho and Marcel Sabitzer emerged simultaneously. Fred and Diogo Dalot were United's last batch of changes.
Garnacho was added to the squad at the expense of fellow winger Facundo Pellistri and Ten Hag confirmed the 18-year-old was fit enough to come on.
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