The Vikings on Wednesday signed two free agents, quarterback Mike Kafka and defensive end Caesar Rayford. Both players, whose signings were tweeted by their respective agents, participated in the veterans combine on March 22 in Arizona.

Kafka, who has not thrown an NFL pass since 2011, spent last season with the Buccaneers. The 27-year-old was a fourth-round pick of the Eagles in 2010. He has spent time with four NFL teams, including the Patriots and Jaguars. His only regular-season action came in 2011, when he completed 11 of 16 attempts for 107 yards with two interceptions over four games with the Eagles.

Kafka, 6 feet 3 and 225 pounds, is from Chicago and played at Northwestern. He is noted in Minnesota for leading Northwestern to an upset 24-17 victory over the Gophers in 2008, rushing for a Big Ten quarterback record 217 yards in the game.

Rayford, 29, played seven games for the Cowboys in 2013. He played in the CFL and the Arena League last season.

MATT VENSEL

Broncos trade for center

The Denver Broncos continued addressing their needs along the offensive line by acquiring fourth-year center Gino Gradkowski from the Baltimore Ravens for 2016 draft picks.

Gradkowski started every game in Baltimore in 2013 but played in only eight games last year after the Ravens obtained Jeremy Zuttah from the Buccaneers.

Denver General Manager John Elway promised quarterback Peyton Manning he'd fix his porous offensive line this offseason. Denver also is expected to focus on the offensive line in the draft.

Cowboys re-sign LB McClain

Rolando McClain, who revived his career in Dallas, will return for at least one more season with the Cowboys. A top-10 draft pick who flamed out after three seasons in Oakland, McClain signed a one-year contract.

Etc.

•The New Orleans Saints agreed to a one-year contract extension with veteran right guard Jahri Evans that lowers his salary cap number, and they signed cornerback Kyle Wilson to a one-year contract. Wilson was a first-round draft pick by the Jets in 2010.

•Running back Daniel "Boom" Herron signed his one-year free-agent tender with Indianapolis. He started for the Colts in last season's playoffs.

•Chicago agreed to one-year contracts with linebacker Sam Acho and cornerback Sherrick McManis. Acho started four games last season for Arizona. McManis played for Chicago, mostly on special teams.