Jimmy Garoppolo's Raiders career might start off with a bang -- that is, if he accepts a once-in-a-lifetime offer from two Nevada brothel workers ... who tell TMZ Sports they wanna hook him up with free sex forever!!
The two lovely ladies are Caitlin Bell and Alice Little of the famous Chicken Ranch brothel ... and they tell us they're really excited the "heartthrob" is moving to their neck of the woods after inking a 3-year deal with the Raiders last week.