Wide receiver Anquan Boldin, the 49ers MVP in his first season with the club, will be back for a second year with the organization.

Boldin announced via Twitter that he is officially back with the team. The deal is a two-year extension, a source told CSNBayArea.com, and is worth $12 million, according to multiple reports.

“49er fans, I wanted to be the first to tell you that I’m returning to San Francisco,” Boldin announced on Monday. “Looking forward to joining my teammates, coaching staff and fans to bring back another championship to the Bay Area. Let’s go after our Quest For Six.”

The contract extension prevents Boldin from reaching the free-agent market. Coach Jim Harbaugh said last week at the NFL Scouting Combine that the entire organization was “lockstep” in their determination to re-sign Boldin. And Boldin, an 11-year veteran, made it known that he wanted to re-sign with the 49ers, too.

The 49ers acquired Boldin last offseason in a trade with the Baltimore Ravens. Boldin caught six passes for 104 yards and a touchdown in the Ravens’ 34-31 victory over the 49ers in Super Bowl XLVII.