UPDATE (5:23 p.m.): The Raiders made the trade official, and announced their 53-man roster. The original story is as follows.
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Raiders coach Jon Gruden said last week that quarterback Derek Carr's backup might not be on the roster.
He was right.
Gruden chose AJ McCarron over Connor Cook or EJ Manuel. The Raiders gave the Buffalo Bills a fifth-round draft pick for the former Alabama quarterback Saturday, according to ESPN.
Cook and Manuel underwhelmed in preseason and training camp, specifically in the second and third exhibitions that proved pivotal to their job status.
Poor play cost Cook a roster spot. The 2016 fourth-round pick, whom the Raiders traded up to take, will be released. Manuel's job remains uncertain at this stage.
NFL
McCarron has three starts to his credit over four years spent with the Cincinnati Bengals. He spent this offseason with the Bills and now is a Raider.
McCarron will have to learn Gruden's system on the fly, meaning Derek Carr's health is even more vital than it was previously. McCarron struggled during his preseason with the Bills, completing 23 of 50 passes for 284 yards and three touchdowns with two interceptions.