The Giants released a statement revealing that the five players taken to Scottsdale Healthcare Osborn Medical Center were Bryce Bandilla, Adalberto Mejia, Dan Slania, Jeff Soptic and Kelby Tomlinson. All returned to the team hotel and were said to be resting comfortably by early afternoon.
Comcast SportsNet Bay Area reported that slugging outfielder Mac Williamson, one of the system's top prospects, was in the car but was uninjured.
The players recently began participating in a three-week conditioning camp at the Giants' training facility.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.