Jimmy Butler and the Miami Heat remain confident they can overturn a series deficit in the NBA Finals, despite the Los Angeles Lakers being one win away from the championship.

The Heat meet Lebron James and the Lakers in Game 5 on Friday, trailing 3-1 and facing defeat in the Finals at Walt Disney World Resort.

Miami face an uphill battle as the Lakers stand on the cusp of their first title since 2010 but Heat star Butler is refusing to surrender in Orlando.

"I don't think it's pressure," Butler told reporters on Thursday. "I think it's just win. Ain't nobody thinking about going home over here. It's just win, so there is no pressure.

"We're expected to win. That's our job. It's not win or go home, it's win or win. That's how we think about it."

"We know what we do every day," the five-time All-Star continued. "I mean, we just love to compete with one another. We realise that there's a chance that it won't look the same next year, but we're in it for the right now. We're going to give everything that we have for one another.

"And like I said, we go back and we're looking at stuff and we're correcting stuff, and we're like, damn, we see it on film. We've just got to be able to see these things in the game.

"So you know, everybody is looking forward to it. Everybody is ready to compete, ready to get one."

Heat head coach Erik Spoelstra, who led Miami to championships in 2012 and 2013 during James' time with the franchise, added: "We think it's a really competitive series.

"We have a purpose of why we're here. We're competing for a title and it's the first team to four wins. There's a lot of different narratives out there -- we don't give a s*** what everybody else thinks.

"This is everything that we wanted this year, an opportunity to fight for, compete for a title. And that hasn't changed at all through these first games."