Tosic joined United from Partizan Belgrade in the January transfer window.
“It was the best moment of my life when I came on,” he told uefa.com when asked about his debut.
“75,000 people. I think I did well in that game.
“Now I hope we will win the championship and try to win the Champions League then, after that, when next season starts, I’m going to get the chance to play.
“I’m happy here in Manchester. I haven’t played a lot of games for the first team, but I have come to the best club in the world.
“I know I have time. I have to practise, get stronger, get faster, be better in all aspects. I feel the [upcoming European] Under-21 championship will help me and I can prove I’m a United player.”
