The fifth-year option would have run the Patriots $11.9 million in 2017, but was guaranteed only for injury and wouldn’t have prevented them from working on a long-term extension over the next year.
Cooper, 26, is a former first-round pick of the Cardinals back in 2013. He’s in the final year of his four-year, $14,549,000 rookie contract that included $14,549,000 guaranteed and stands to make a base salary of $675,000 for the 2016 season.
The Cardinals traded him to the Patriots as part of the Chandler Jones’ trade a few months ago.
In 2015, Cooper appeared in 14 games for the Cardinals and was rated by Pro Football Focus as the No. 41 guard out of 81 qualifying players.