Juve and Milan drew 1-1 in the first-leg of their semifinal at San Siro on Thursday.
“It's important to score an away goal, but a team like ours cannot just be happy to allow Milan an opener and put the game in doubt," Bonucci told Rai Sport.
“We have to get back in shape, everyone needs to step up and do more. It wasn't a bad performance, but Milan pressed high and at this moment we need to do more, because what we're doing during the week is not enough.
“We're in the running on all three fronts, but certainly have to improve in the way we move the ball with pace, not get wrapped up in pointless bits of skill, as we have players who can change a game.
“There's a tour de force coming up in April, so we've got to sort our issues out and be ready for that."