The Oakland Raiders have added a big arm to back up incumbent starting quarterback Derek Carr. The Silver and Black announced on Friday that they have signed journeyman signal-caller Mike Glennon.

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NFL Network's Ian Rapoport subsequently reported that Glennon was signed to be the Raiders' second-string quarterback behind Carr, unless the team selects a quarterback in first round of the NFL Draft on April 25.

Oakland owns more first-round picks than any other team in the NFL. The Raiders hold the fourth pick after finishing the 2018 season 4-12, and will also be on the clock for the 24th and 27th picks in the first round, both acquired in trades last season – the former from the Chicago Bears in exchange for superstar pass rusher Khalil Mack, and the latter from the Dallas Cowboys for wide receiver Amari Cooper, a former top-five pick.

It's unclear what direction coach Jon Gruden and general manager Mike Mayock are planning to go with the No. 4 pick. Previous reports linked Oakland to Oklahoma quarterback Kyler Murray, who is under consideration for the Arizona Cardinals with the No. 1 pick in the draft.

Derek Carr, 27, was considered one of the league’s most promising young quarterbacks as recently as 2017. His luster wore off last season, though, when he threw just 19 touchdowns compared to 10 interceptions and led the league with 12 fumbles.

Mike Glennon played in two games for the Cardinals last season while backing up rookie Josh Rosen. He completed 15 of 21 passes for 174 yards, one touchdown, and no interceptions in appearances against the Atlanta Falcons and Los Angeles Rams.