The 49ers have signed a defensive back. But not either of the two Niners fans are hoping for.

The Niners have inked former Rams safety Craig Dahl.

“We are pleased to announce the signing of Craig,” 49ers G.M. Trent Baalke said. “He is an experienced veteran with excellent intangibles, who has working knowledge of the NFC West.”

Dahl was a 16-game starter for the Rams in 2012. Two of those games came against the 49ers, so they know him pretty well.

They’ll know him even better in the future.

And in the immediate future, Niners fans will hope that either Nnamdi Asomugha or Charles Woodson will be agreeing to terms.

[Photo credit: 49ers Twitter page.]