SANTA CLARA -- Carlos Rogers' tenure is up as the 49ers' most experienced and arguably most trusted cornerback since 2011. Rogers is expected to formally get cut Tuesday once free agency gets underway, a source confirmed.

Rogers might not be the only defensive back out the 49ers' door, as cornerback Tarell Brown and safety Donte Whitner are pending free agents.

That trio's potential exit would leave no defensive backs from the 49ers' Super Bowl XLVII starting lineup, an exodus that began with Dashon Goldson's free-agency departure a year ago for the Tampa Bay Buccaneers' riches.

Rogers' release isn't expected until after the league year begins at 1 p.m. Tuesday, thus classifying him as a post-June 1 cut and defraying some of his salary-cap hit this season. The 49ers would gain $6.6 million of cap room, but they'd have $1,494,532 of dead money in 2015, according to former agent Joel Corry.

Rogers was scheduled to make $6.25 million in base salary this coming season as part of a four-year, $31 million deal he signed only two years ago.

Rogers' exit will leave the cornerback corps thin and inexperienced, unless another veteran is signed.

With Brown, Eric Wright and Perrish Cox slated to become free agents Tuesday -- Cox wasn't tendered as a restricted free agent -- the 49ers cornerback corps currently consists of Tramaine Brock, Chris Culliver, Darryl Morris and Dax Swanson.

Rogers, 32, started every game the past three seasons until a hamstring injury kept him from the first two playoff games in January. Rogers returned for the NFC Championship loss at Seattle, and he allowed a go-ahead touchdown to Jermaine Kearse on a fourth-down pass in the 23-17 loss.

After totaling six interceptions in 2011, Rogers re-signed with the 49ers on a four-year deal at the start of free agency in 2012. He made the Pro Bowl for his 2012 efforts, then declined a pay cut before last season.

The 49ers have several other key free agents: kicker Phil Dawson, center Jonathan Goodwin, running back Anthony Dixon, special-teams ace Kassim Osgood and wideout Mario Manningham.

General manager Trent Baalke has placed an emphasis on re-signing the 49ers' own players. So far this season, that's included re-signing wideout Anquan Boldin and extending the contract of center/guard Daniel Kilgore.