Trawick is appealing the fine, which follows an unpenalized collision on a third quarter special-teams play.
The NFL fined Trawick for an "illegal blindside block," regarded as unnecessary roughness by vice president of football operations Merton Hanks.
Trawick is signed to a three-year contract worth $1.487 million, including a $405,000 base salary this year and a $2,000 signing bonus.
Under Article 46 of the NFL collective bargaining agreement, a player has the right to appeal that a fine is excessive when compared to the player's expected earnings. A fine can be reduced if it exceeds 25 percent of one week of a player's salary for a first offense and 50 percent of one of week of a player's salary for a seocnd offense. A player can argue on appeal that the circumstances don't warrant receiving a fine above the amount stated in the schedule of fines.
If Trawick makes the Ravens' 53-man roster, he would be due $23,823 per week, which means the $21,000 fine exceeds 25 percent of his weekly pay.
Trawick blocked a punt against Tampa Bay that was recovered by wide receiver LaQuan Williams for a touchdown.
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