(Reuters) - An $11,000 fine for unsportsmanlike conduct levied against San Francisco 49ers quarterback Colin Kaepernick resulted from his use of a racial slur during a game last week, Fox Sports reported on Sunday.

Fox Sports' Jay Glazer, citing an unidentified National Football League referee, said Kaepernick slung the "N-word" at Chicago Bears' defender Lamarr Houston as the two exchanged insults after a play in the Sept. 14 game. Houston is black and Kaepernick is biracial.

Kaepernick has denied using inappropriate language and said he would appeal the fine.

In the locker room after the game, Houston told the Chicago Tribune he did not recall an insult hurled by Kaepernick.

"I didn't hear anything," he said.

(Reporting by Victoria Cavaliere in Seattle; Editing by Peter Cooney)