Tennessee Titans defensive coordinator Jerry Gray's comments have triggered an investigation by the NFL, according to sources.

"If you are worrying about that, you are not going to go out and try and blow the guy up," Gray told The Tennessean on Thursday. "Great football players have to put that out of their mind. You have to say, 'This is my territory between the numbers, and if you throw the football you better bring the Gator truck.' And that's how you have to play. You can't play timid in the NFL."

The Gator is the used to take injured player off the field.

Gray coached under Gregg Williams for multiple teams.

According to a Titans source, Gray believes the NFL's willingness to fine players has adversely influenced the mentality of his players, and he was attempting to change their thought process.