The Rockies have spoken to the Mariners about a possible David Aardsma trade, reports Troy Renck of the Denver Post (Twitter link). Colorado has also shown interest in right-handers Grant Balfour and Todd Coffey, though Renck tweets that Balfour would have to be acquired in a "sign-and-trade" arrangment since the Rockies don't want to lose their first round draft pick as compensation for signing the Type A free agent.
Aardsma, who is known to be on the market, would be used in a set-up role with the Rockies since Huston Street is established as Colorado's closer. Balfour's Type-A status isn't the only hindrance to a possible signing, as he reportedly wants a three-year contract. The Rockies may be hesitant to give a middle reliever that kind of long-term commitment, though Joaquin Benoit, Jesse Crain, Scott Downs and Matt Guerrier have all signed three-year deals this winter.
Coffey, non-tendered by the Brewers earlier this month, comes with the smallest price tag but is also coming off the least-accomplished season (4.76 ERA, 9.4 H/9 rate) of the three pitchers. Renck adds that Colorado's "wish list" also includes Jon Rauch and Chad Qualls (Twitter link).