Nick Mullens is expected to serve as Derek Carr's backup after signing a one-year deal with the Raiders. Scott Galvin-USA TODAY Sports

The Raiders are signing Nick Mullens to a one-year deal (Twitter link via NFL.com’s Mike Garafolo). The quarterback will receive just over $1M guaranteed with a chance to earn up to $2.5M via incentives (Twitter link via Field Yates of ESPN.com).

Mullens will support Derek Carr on the Raiders’ depth chart, alongside Garrett Gilbert. It’s not a given that the Raiders will carry three QBs on their final roster, so it may be a one-or-the-other scenario. For what it’s worth, Mullens has $1.5M guaranteed versus sub-$100K locked in for Gilbert.

Mullens, 27, has appeared in 20 games over the course of his career with 17 starts. The bulk of those starts came with the Niners, where he spent his first three seasons. Last year, he made just one start for the Browns — a December loss to the Raiders.

Meanwhile, the Raiders have kicked off extension talks with Carr. The 31-year-old currently has one year to go on his contract with a cap hit of $19.8M.

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