SANTA CLARA -- Quarterback Colin Kaepernick's next back-up potentially will be Blaine Gabbert, who the 49ers acquired Tuesday in a trade with the Jacksonville Jaguars.

The 49ers passed on Gabbert in the 2011 draft to select his Missouri teammate, Aldon Smith, No. 7 overall. The Jaguars, who took Gabbert at No. 10, received a sixth-round pick in their deal with the 49ers, ESPN first reported.

"We thought highly of Blaine as an early entry into the 2011 NFL Draft," 49ers general manager Trent Baalke said in a statement. "He is a high-character individual that will be given every opportunity to develop within our system and we are looking forward to working with him."

Gabbert went 5-22 as a starter, and he lost his job last season to Chad Henne for the Jaguars (4-12). That move was enhanced by a hamstring injury Gabbert sustained in Week 5. In the three games Gabbert did play, he produced one touchdown pass and seven interceptions.

ESPN analyst Bill Polian, a former Colts executive, expressed doubt that Gabbert would seize the No. 2 role that Colt McCoy filled last season behind Kaepernick. "I would not count on him to contribute to the squad," Polian said on ESPN.

Gabbert (22 career touchdown passes, 24 interceptions) is scheduled to make $2,011,587 in the final year of his contract. Kaepernick's rookie contract is also entering its final season, albeit at less than half that amount ($973,766).

The only other quarterback on the 49ers' roster is McLeod Bethel-Thompson, who finished last season on the practice squad.