Former Stanford signal caller Andrew Luck is officially an NFL quarterback. Luck signed a four-year contract on Thursday, allowing him to participate in the team's rookie training camp later this month. The contract is fully guranteed, but specifics are not know at the moment.

From the Indianapolis Star:

Colts owner Jim Irsay later tweeted out: "12 is officially signed!!!!!" along with a photo of Luck signing his contract.

The precise value of the deal was not immediately available but the NFL's rookie salary scale dictates that it closely resemble that signed by Luck's predecessor as the first pick in the draft, Carolina Panthers quarterback Cam Newton.

Newton signed for $22.05 million with a signing bonus of $14.5 million last year. Luck was not available for comment.

With Luck under contract, he is free to report to a three-day rookie training camp prior to the Colts' team-wide July 28 reporting date and the Colts have only two of their 10 draft choices to sign. They are Stanford tight end Coby Fleener, a second-round pick, and Clemson tight end Dwayne Allen, a third-round selection.

Speaking of Luck, he remains atop our main page as one of the all-time Heisman "subs."

For more on Stanford, visit Rule of Tree and for news on the Colts, check out Stampede Blue.