The Rams barely any cap room to work with, so this money should help them when it comes to signing DT Aaron Donald to a long-term extension, which some believe is close and could be announced any day now.
Whitworth, 36, is a former second-round pick of the Bengals back in 2006. He spent 11 years in Cincinnati before signing a three-year, $33.75 million contract that included $15 million guaranteed with the Rams last year.
Whitworth stands to make base salaries of $8 million and $10.25 million over the final two years of the agreement.
In 2017, Whitworth appeared in all 15 games for the Bengals and is rated by Pro Football Focus as the No. 11 offensive tackle out of 79 qualifying players.