The Sacramento Bee reported Wednesday that Kaepernick will train and study with Warner -- as well as quarterbacks coach Dennis Gile -- with film, board work, drills and mental aspects of the game at EXOS in Phoenix.
"If we can teach him [consistency and efficiency], then I think he becomes one of the most dangerous quarterbacks in the NFL," Gile told the Bee. "Because you can't teach the natural talents that he has."
Kaepernick is scheduled to arrive in Phoenix next week and will train at EXOS until the 49ers' offseason program begins in March, according to the newspaper. Odell Beckham Jr. of the New York Giants and Jarvis Landry of the Miami Dolphins are among the receivers expected to train at EXOS this offseason. Three of Kaepernick's teammates -- receivers Quinton Patton and Bruce Ellington, fullback Bruce Miller -- also are expected to train there, according to the newspaper.
Kaepernick's mechanics came under scrutiny this season as the 49ers' offense struggled to find consistency after moving away from the power-running game that helped them advance to three straight NFC title games.
"There's always things you can tighten up," Kaepernick said in December."It's hard to break habits in-season. You don't want to completely try to change something because it can throw off everything else you're doing."
Although he threw for a career-high 3,369 yards, Kaepernick's total QBR plummeted to 55.9, ranked 17th in the NFL this season. That's after ranking sixth in 2013 with a 68.6 QBR.
The 49ers' dual-threat quarterback also ran the ball 12 more times this season and racked up 115 more yards rushing than in 2013. His average yards per rush went up from 5.7 in 2013 to 6.1 this season.
He had 19 touchdown passes and 10 interceptions this season.
Paul Gutierrez of ESPN.com contributed to this report.
Kaepernick Hires Tutor With MVP Credentials
Phil Savage discusses how two-time MVP and Super Bowl XXXIV champion Kurt Warner can help quarterback Colin Kaepernick during the offseason.