Kaepernick said the letter he received for the fine did not specify what language was used. He has maintained that he did not use the slur he is accused of.
According to FOX Sports' Mike Garafolo, half of the fine was upheld because of "general profane language."
The NFLPA tweeted that they are "disappointed" Kaepernick's fine was not completely eliminated since no racial slur was found to be used.
Kaepernick also posted a photo on Instagram about his fine being reduced but not cleared:
The face you make when the NFL says you didn't use a racial slur and still fines you $5500? *shrugs* back to my grind! #IDontGetTired #WhoDoYouLove #Se7enPounds
Kaepernick was recently fined $10,000 for wearing Beats by Dre headphones during a postgame press conference. Earlier this month, the NFL prohibited players from wearing Beats by Dre brand merchandise on camera, a step meant to protect the league's partnership with Bose.
Kaepernick has thrown for 1,456 yards, 10 touchdowns and four interceptions in six games this season.
The 49ers play the Broncos in Denver on Sunday.
- Molly Geary