Mariners pitching coach Carl Willis told Geoff Baker of the Seattle Times that he hasn't decided who that person will be, but it's unlikely it will be one of the team's younger pitchers, such as Dan Cortes or Josh Lueke.
"You can't rule out a younger guy that we have with the staff," Willis said. "But I don't think it's fair to be pushing an inexperienced guy into that role right away."
The most likely candidates are Brandon League (pictured), Manny Delcarmen and Chris Ray, Willis told Baker.
League filled in for Aardsma at the end of last season, picking up six saves during the season and is likely the favorite.
Ray served as the Orioles' closer in 2006 and 2007, has 51 career saves, but underwent Tommy John surgery in 2007 and hasn't regained his form.
Last season, he played for the Rangers and Giants, going to San Francisco in the trade that sent Bengie Molina to the Rangers. He was not on the postseason roster.
Delcarmen has three career saves, one in 2007 and two in 2008.
-- C. Trent Rosecrans