The Mariners are hopeful that Dunn (shoulder) will be able to throw a bullpen session in the coming days, Corey Brock of The Athletic reports.
Dunn has been on the injured list since June 18 due to a right shoulder strain but suffered a setback in his recovery in early August. If the right-hander is unable to progress to throwing a bullpen in the near future, the Mariners are expected shut him down for the remainder of the season.