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UPDATE (Thursday, 3:15 p.m.): The Raiders officially announced Mack's signing on the team website.
Khalil Mack showed up Thursday afternoon for Raiders rookie minicamp and promptly signed on the dotted line. The outside linebacker selected No. 5 overall inked a four-year, $18.7 million contract before starting the four-day instruction period, according to league sources.
Under the NFL's rookie wage scale, Mack's draft slot mandates that he receive a fully guaranteed four-year $18.7 million contract that includes an $11.9 million signing bonus. According to CBS contributor and former NFL agent Joel Corry, Mack will receive fully guaranteed roster bonuses on the third day of training camp starting in 2015 -- $758,955 in '15, $1,517,910 in '16 and $2,276.865 in '17 in exchange for offset language. In short, offset language helps a team recoup some money if a player is released and then signs with another team.
As a first round pick, the Raiders have a fifth-year option worth the transition tag (at the time the option is picked up) for his position.
With little negotiating room in a rookie wage scale with salaries slotted based upon where players were drafted, completing contracts is far easier now than in the past. Mack is the highest draft pick to sign a contract with the team that drafted him.
Also, Mack has officially been given No. 52. He wore No. 46 at the University of Buffalo, but he isn't allowed to wear that number in the NFL. The new number is an homage to Ray Lewis, his favorite linebacker growing up.