United and Benfica drew 1-1 for their UEFA Youth League tie.
Ethan Hamilton opened the scoring for United before they were pegged back by a Felix goal. The exciting teenage talent is being tracked by United and Liverpool this season.
Hamilton fired United ahead after only three minutes, reward for pressing from the front by Nicky Butt's side. The Scottish midfielder aggressively robbed Gedson Fernandes and kept his composure to stroke past an exposed Daniel Azevedo with his left foot.
However, Felix's equaliser arrived after Medina Etienne escaped down the right flank and crossed to the far post, where he pounced ahead of George Tanner to nudge in the equaliser.