From http://www.cbssports.com/mlb/blog/danny-knobler:

Phillies scouts have been spotted doing a second tour of the Tigers’ farm system.

[we will] see what that could mean, with the Tigers needing a closer and with Jonathan Papelbon sitting in the Phillies bullpen.

And http://msn.foxsports.com/mlb/story/tim-lincecum:

Multiple sources told me recently that some teams — the Tigers are one — have interest in acquiring Lincecum as a reliever for the stretch drive.

UPDATE:

The Detroit Tigers have been looking for relief help since they decided in spring training that Bruce Rondon would not be the immediate answer at closer. 

The Tigers, however, remain a first-place team, and their bullpen came out of the All-Star break by throwing 7 1/3 scoreless innings in a weekend series in Kansas City, as Chris Lott of MLive.com points out. Joaquin Benoit capped the series by earning his ninth save in Sunday’s 4-1 win.

That doesn’t mean the Tigers aren’t looking. ESPN The Magazine’s Buster Olney tweeted Saturday there is “some hope” in the organization that Milwaukee’s Francisco Rodriguezcould end up in the Motor City.

Meanwhile, Jon Morosi of FoxSports.com tweets that the Tigers have made “initial inquiries” on Padres relievers, which could mean Huston Street and/or Luke Gregerson. Street, under contract for 2014 at $7 million, would give the club an answer at closer beyond a three-month rental.

via Detroit Tigers