Darlington adds that the formal release that would make Suh available to other teams is likely to happen on Wednesday.
The 31-year-old is a five-time Pro Bowler and three-time first-team All-Pro. He made 47 combined tackles last season, adding 4.5 sacks and two forced fumbles.
Suh signed a six-year, $114-million contract with the Dolphins in March 2015 as a free agent, after spending the first five years of his career with the Detroit Lions, who selected him second overall in the 2010 draft.
Suh represented a cap hit of $26.1 million in 2018.
Cutting Suh will leave the Dolphins with $22.2 million in dead cap space, according to Spotrac. Applying the post-June 1 designation to his release will allow them to spread that hit over the next two seasons, with $9.1 million counting against the 2018 cap and $13.1 million left to count against the cap for 2019, according to Edward Lewis of NFL.com.
Suh shared a tweet Monday morning stating that he was in Seattle and that his followers "should stay tuned, there'll be some exciting news going on."