SAN FRANCISCO — The San Francisco 49ers made it official with free agent cornerback Nnamdi Asomugha, signing him to a one-year contract Wednesday that could pay him as much as $3 million.

Asomugha and the reigning NFC champions reached agreement on the deal Tuesday. The contract has no guaranteed money. Asomugha, 31, is due to earn a base package of $1.35 million with salary and bonuses, and could make an additional $1.65 million in incentives for playing time, awards such as the Pro Bowl and reaching the playoffs.

The former All-Pro was released by the Philadelphia Eagles on March 12 after two disappointing seasons — and now he is ready to help the 49ers return to the Super Bowl and win after losing 34-31 to the Ravens on Feb. 3 in New Orleans. Now, he gets another start right back where his football career began.

He had 55 tackles and an interception last season, and finished his two-year stint with the Eagles with 95 tackles and four interceptions.

Raiders

TEAM ANNOUNCES SIGNING OF PORTER: In Alameda, Calif., Raiders General Manager Reggie McKenzie announced the signing of free-agent cornerback Tracy Porter on Wednesday, adding an experienced starter to an untested unit.

Porter, the Port Allen native and former Saints cornerback, played only six games last year for Denver because of problems with seizures and a concussion. He spent the previous four years in New Orleans. Raiders coach Dennis Allen was the secondary coach for the Saints in Porter’s first three seasons.

His most productive season came in 2009, when he had four interceptions in the regular season and a Super Bowl-clinching interception return for a touchdown against Peyton Manning.

The other cornerbacks currently on Oakland’s roster have combined for four career starts.

Falcons

Exonerated LB Banks gets his chance: Brian Banks signed with the Atlanta Falcons on Wednesday after the former USC recruit’s football dream was derailed when he was convicted of rape and kidnapping charges a decade ago.

The linebacker will participate in Atlanta’s offseason workouts with a chance to resume his career. Banks, 27, has been trying to get back into football since he was cleared on May 12, 2012, of a rape conviction.

The Falcons are the first NFL team to sign Banks, but he has had chances with other teams. He took part in the Seattle Seahawks’ minicamp last June following workouts with Kansas City and San Diego. He had one tackle in two games with Las Vegas Locomotives of the United Football League (UFL).

Atlanta general manager Thomas Dimitroff said the 6-foot-2, 250-pound Banks also worked out for the Falcons last year.

“We had a chance to work him out last year and have been monitoring his progress since then,” Dimitroff said in a statement released by the team. “He has worked extremely hard for this chance over the last year and he has shown us that he is prepared for this opportunity. We are happy that Brian will have a chance to live out his dream of playing in the NFL and we look forward to seeing him on the field.”

Panthers

TEAM AGREES TO TERMS WITH WR HIXON: The agent for unrestricted free agent Domenik Hixon says his client has agreed to a one-year contract with the Carolina Panthers.

Agent Eric Metz said Wednesday his client is “very excited about joining Carolina” and feels it’s a “great fit” after spending the last two days visiting with coach Ron Rivera and offensive coordinator Mike Shula.

Hixon started three games last season for the Giants and played in 13, recording 39 receptions for 567 yards receiving and two touchdowns.

He’s expected to compete for the No. 3 receiver spot.

Redskins

TEAM brings back Grossman: In Ashburn, Va., the Washington Redskins are bringing back Rex Grossman and giving Pat White another chance at the NFL.

Grossman agreed to a one-year deal to return to the Redskins on Wednesday. White also agreed to sign with Washington, giving the team a mobile quarterback to help run practices while Robert Griffin III recovers from a serious knee injury.

Grossman has played nine NFL seasons and once took the Chicago Bears to the Super Bowl, but he again is projected to be the third-stringer behind Griffin and Kirk Cousins.

Griffin had reconstructive surgery on his right knee in January. Cousins is expected to work as the starter during offseason practices, but White can better simulate Griffin’s speed and running ability.

White last played in the NFL for the Miami Dolphins in 2009.