Crennel said that he made the move to Quinn in order to spark some life into a 1-5 Chiefs squad which has struggled mightily this season.
"Probably the most impactful move I could make to get everybody’s attention was to change the quarterback,” Crennel said Monday.
"I’m not saying Matt Cassel is the reason we are where we are. The stroke of that brush is a broad stroke and everybody is included in it. We’re trying to make this better, get this better. We need to coach better, we need to play better. If we do those things, then we can be better.
"My biggest deal was my gut (feeling) in telling me that I needed to impact the team by changing the dynamic, by having a different dynamic. Brady Quinn is the guy I want to go with."
Crennel also said that the move is not just for the game against the raiders and he would like Quinn to play without the thought of losing his starting role.
Matt Cassel has been hurt as of late, but team doctors have given him the green light to play. He also has the lowest passer rating in the NFL and has turned the ball over 14 times this season (nine interceptions and five lost fumbles).
Quinn started last week for the Chiefs against the Bucs, but the Chiefs were never in the game as Tampa Bay throttled the Chiefs, 38-10.