The Mariners said Dyson has a “core-muscle issue and sports hernia," according to Johns. Dyson was previously on the 10-day disabled list from Aug. 19-31 with what was diagnosed as a right groin strain. He tried to come back in early September, playing in two games before he decided to shut himself down.
The 33-year-old Dyson led the Mariners with 28 stolen bases while posting a posted a .251/.324/.350 slash line in 111 games. He also hit a career-high five home runs and had 30 RBI.
Dyson will be a free agent at the end of the year after spending one season with the Mariners. They acquired him from the Royals for right-hander Nate Karns in January. He is one of four Seattle position players who will be free agent, along with first baseman Yonder Alonso, third baseman Danny Valencia and catcher Carlos Ruiz.
Rookie Guillermo Heredia will patrol center field full time now that Dyson is on the shelf. While Dyson had been out, Heredia posted a .264/.329/.362 slash line with six homers, 24 RBI and 40 runs in 110 games.