Martinez (thumb) is highly unlikely to return this season, the team's official site reports.
The right-hander hasn't been able to do much throwing since his mid-July surgery to repair a ligament in the thumb on his throwing hand. While manager Mike Shildt hasn't completely ruled out the possibility of the veteran returning to the big-league mound before season's end, he conceded last week that "it's going to be hard for him to do."