Kevin Durant ominously said he will "only get better" after he scored 31 points on his return from a 21-game injury lay-off but that was not enough as the Brooklyn Nets lost 113-107 to the Miami Heat.

Brooklyn went 5-16 in Durant's absence, sliding from second in the Eastern Conference to eighth, after he sustained an MCL sprain on January 16.

The Nets led by as many as 16 points in the first half but the Heat fought back to win, with Durant playing 35 minutes on his return, scoring 31 points with four rebounds and four assists.

"I felt great. I'm only going to get better and get more comfortable out there," Durant said during his post-game news conference.

"Take more of the load out there too when I get more games under my belt. I felt solid."

The Nets were missing Kyrie Irving who is unable to play in home games at the Barclays Center due to the New York City vaccination rules, while recruit Ben Simmons is still yet to debut as he builds up his conditioning having not played all season.

Durant played alongside new signings Andre Drummond, Seth Curry and Goran Dragic in the starting line-up for the first time and admitted their cohesion may take time.

"It can take one game, it can take 20 games," he said. "It's a matter of getting out there and seeing what works for us.

"It's not like a certain formula that goes into how you know to build chemistry. It's an organic thing that happens naturally."

The Nets do not have time on their side, with the defeat leaving them at .500 with a 32-32 record having lost three in a row.

"It's to focus on the details every day," Durant said when asked what his short-term focus was. "Obviously winning basketball games, I don’t even need to say that, that's always the goals.

He added: "You've got to give Miami credit. There's no moral victories, but we look at the film, we know how we play, we know what we need to do to win."