Update -- MLB.com's Jason Beck was told by Tigers General Manager Dave Dombrowski Detroit is not pursuing any relievers and he would be surprised if a move was made.
Detroit has been seeking bullpen stability all spring and may be close to adding another piece before the start of the regular season. According to FOX Sports' Jon Morosi, the Tigers are close to acquiring an unknown relief pitcher. The club became interested in adding another bullpen piece after announcing Bruce Rondon will open the season on the disabled list on Thursday.
As spring training comes to a close, the Tigers' bullpen has mostly taken shape, with Joe Nathan slotted to be the club's closer once again in 2015 despite an inconsistent 2014 campaign and a rough spring. Nathan posted a 4.81 ERA and 3.94 ERA in 58.0 innings while saving 35 contests last season.
Joakim Soria will be the Tigers' primary setup man, with Joba Chamberlain, Al Alburquerque, Tom Gorzelanny, and Ian Krol all likely pitching out of Detroit's bullpen to open the season. Angel Nesbitt could also earn a roster spot after a productive spring. Kyle Ryan and Blaine Hardy were also competing for relief jobs, however both will open the season with Triple-A Toldeo, according to MLive's Chris Iott.
Several squads have been open to trading relievers this offseason, and after veteran bullpen arms have been released, a free agent signing can also be possible. After Francisco Rodriguez resigned with the Brewers, Rafael Soriano emerged as the top remaining free agent bullpen arm, although Soriano lost his role as Washington's closer last season and could be costly. Jose Valverde, Jose Veras, Juan Carlos Oviedo, Matt Lindstrom, and Dustin McGowan are all also available possibilities.
Iott also notes that if a deal does get done for a potential bullpen arm, it will likely be a minor league deal that yields a minor piece. A deal that adds minor league depth is possible, as Manager Brad Ausmus told Iott he would be "shocked" if the 25th player on the club's roster came from outside the organization.