The Las Vegas Raiders will be without Jimmy Garoppolo on Sunday against the Chicago Bears, according to a source.

Garoppolo is dealing with a back injury.

The Raiders will turn to either rookie Aidan O'Connell, who started Las Vegas' Week 4 loss at the Los Angeles Chargers with Garoppolo out with a concussion, or veteran Brian Hoyer, who replaced the injured Garoppolo at halftime of Sunday's defeat of the New England Patriots.