The play-in tournament may be here to stay with NBA commissioner Adam Silver stating that his personal preference is for it to continue beyond this season.

Teams ranked seventh to 10th in both the Western and Eastern Conference have faced off in the play-in tournament for the seventh and eighth seeds in the 2020-21 season.

The additional spots available for the playoffs added intrigue late in the NBA season, with 24 of the 30 franchises maintaining the possibility of playing in the postseason in the final fortnight.

The play-in tournament has been criticized for being unfair, with Los Angeles Lakers star LeBron James publicly vocal in his dislike of the concept.

"Whoever came up with that needs to be fired," James said earlier this month.

But Silver defended the play-in tournament, insisting it added vital viewership interest to the season, given the incentives for teams to compete.

"I haven't made any secret that I want it to be [around long term]," Silver told ESPN Radio.

"I have two constituencies I need to convince of that. One is the 30 teams, and I think for the most part they've supported it. I understand the sentiment if I were a team - a seven-seed in particular - the notion [that] after a long season, you could potentially play out of the playoffs. I understand those feelings.

"I think at the same time, the teams recognize the amount of additional interest we've created over the last month of the season plus those play-in games make it worth it.

"Of course, the other constituency is the players. For example, one player, who is on the executive committee of the union, said to me yesterday that he really likes the play-in tournament but he felt it could potentially be a bit unfair.

"For example, if you were the seventh seed and you were a significant number of games ahead of the eight-seed, the notion that you could somehow lose two games and be out of the playoffs seems unfair."

The sides who finished seventh in both conferences won their play-in games to claim seventh seed, while the Washington Wizards eventually took the eighth seed in the East with victory over the Indiana Pacers after finishing eighth.

The Golden State Warriors, who finished eighth on the Western Conference standings, play the Memphis Grizzlies for the eighth seed in the last play-in game on Friday.

Silver said it is possible that the league will tinker with the current play-in format.

He added: "I'm going to wait only because I know there's people on both sides of it.

"Beyond the individual ratings, and some games have been pretty good and some haven't been as close, but putting aside those games and adding those games to our schedule and the amount of interest in them is where I think the play-in tournament had an impact.

"[It] was causing teams who frankly otherwise may have thrown in the towel some number of weeks back to fight for those last playoff spots."