Rashford felt they could've done more for the 1-0 Champions League quarterfinal first-leg defeat.
He said, "I think we have to do things more as a team. When they have the ball we have to press, and everyone has to press.
"When we have the ball and we're attacking then everyone has to be up, so if we lose the ball we can win it back quickly. They're a top team with some top players, and we knew it was always going to be difficult. They got a goal in the first half but other than that the game was quite even.
"It was a tough game but I thought we got into some decent positions; we just struggled to create real clear-cut opportunities. We understand as a team that we have to go into the second leg with a positive mind-set and get the job done."