TMZ Sports has just obtained the mug shot that Nate Hobbs took after his DUI arrest earlier this week ... and you can see in the photo, the Raiders player clearly wasn't happy to be in custody.
We broke the story ... Hobbs was arrested early Monday morning in Las Vegas after cops say he was found passed out behind the wheel of his car in the exit lanes of a parking garage at The Cromwell.
In new police docs, cops say when they made contact with the Las Vegas cornerback -- who had just played in the team's win over the Colts on Sunday afternoon -- he smelled like booze and had "glassy watery eyes."
Officers also said in the docs that Hobbs had mumbled speech.
Hobbs, though, according to the cops, said he was not drunk ... and instead told them he had fallen asleep in his 2019 Mercedes because "he was just tired."
But police say when they put him through a set of field sobriety tests, he "failed said tests" and was ultimately arrested.
Hobbs was booked on a misdemeanor DUI charge ... and he posed for a mug shot photo looking stern in a pink T-shirt. He's now due in court for a hearing on the matter in May.
Hobbs' attorneys told us following the arrest they have "serious concerns" that Hobbs' situation "does not qualify as a DUI under Nevada law."
The Raiders, meanwhile, say Hobbs is -- for now -- still slated to play in the team's critical game against the Chargers on Sunday despite the run-in with officers.