Eric Bailly concedes Manchester United's morale dipped after conceding the first goal in Tuesday's 2-0 Champions League defeat to Paris Saint-Germain.
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Di Maria had a second assist seven minutes later with a pinpoint pass for Kylian Mbappe, leaving the Red Devils with a mountain to climb in the return fixture.
Centre-back Bailly acknowledged the first goal changed the complexion of the tie but he is keen to move on from the setback.
"It's difficult, it's a big disappointment. We were off to a good start," he said.
"In the first half, we were fine. We conceded a goal from a set piece and took a blow to our morale. Then we conceded a second goal.
"Now we're going to forget about this game. There are more matches to come and think about in the future."
Ole: "It’s not going to be a season-defining one for us. It has to be one that we’re going to learn from." #MUFC #UCL pic.twitter.com/bp6FZojKLA
— Manchester United (@ManUtd) February 12, 2019
But Bailly insists there was no overconfidence among the squad.
"No, we played on our strengths," he added. "We played on the counter-attack.
"The first half we were good, we defended well. On a mistake, we conceded the first goal.
"After that, the team tried to give its best. Unfortunately, the second goal came next, so it's a shame."
Next up for the Red Devils is a fifth-round FA Cup tie against Chelsea on Monday, before a huge Premier League showdown against Liverpool six days later.