from Raiders' Jimmy Garoppolo (back) will not compete against the Bears.

Nevada's HENDERSON -- Jimmy Garoppolo, the quarterback for the Las Vegas Raiders, will miss Sunday's game against the Chicago Bears due.

To a back ailment, a source informed ESPN's Adam Schefter on Thursday.

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Due to Garoppolo's concussion, the Raiders (3-3) will either turn to rookie Aidan O'Connell.

Who began Las Vegas' Week 4 loss at the Los Angeles Chargers, or 15-year veteran Brian Hoyer.

Who took over for the injured Garoppolo at halftime of Sunday's victory over the New England Patriots.

While Justin Fields is questionable due to a dislocated thumb, youngster Tyson Bagent is expected to start as quarterback for the Bears (1-5).

On Thursday, neither Hoyer nor O'Connell would confirm who would start for Las Vegas against the Bears.

Yes, O'Connell answered, "just try to do my job every day." "Aim to improve. Learn, definitely. 

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