The NBA has banned an investor from attending games and Golden State Warriors team activities for one year for "pushing and directing obscene language toward the Toronto Raptors' Kyle Lowry".

Warriors investor Mark Stevens also received a $500,000 fine for his actions during game three of the NBA Finals between the Raptors and the Warriors.

Toronto guard Lowry had fallen into the crowd attempting to retrieve a ball during the Raptors' 123-109 win at Oracle Arena, at which point the player was pushed before getting back to his feet.

Before the NBA announced the ban and fine, Los Angeles Lakers player LeBron James said on Instagram: "There's absolutely no place in our BEAUTIFUL game for that AT ALL.

"Mr Stevens' behaviour last night did not reflect the high standard that we hope to exemplify as an organisation," the Warriors said in a release.

"We're extremely disappointed in his actions and, along with Mr Stevens, offer our sincere apology to Kyle Lowry and the Toronto Raptors organisation for this unfortunate misconduct."

The Raptors lead the series 2-1 going into game four.