The attacking midfielder feels that his side should have done better in front of goal at Old Trafford, declaring that the Ukrainians are now focusing on winning the Europa League
The Ukrainians created a number of good chances at Old Trafford yet failed to find the net as David de Gea proved to be too great an obstacle.
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"Our failure to take our chances [in the first half] had a real impact on the game because we could have scored those goals but we lost - that's football," the Brazilian told Uefa's official website.
"We didn't expect the night to end like this but it's a lesson for us. We are learning and now we have to turn the page and try again next season.
"Now the Europa League: I think we've played in it once and won it [in 2009]. We will try to do that again. For us, and any other team, the Europa League is also important."
Shakhtar finished third in Group A with with eight points from six games, two points behind runners-up Leverkusen.