It seems to me that the Tigers may have more September call ups than the last few years.  They have a number of players with major league experience, a number of players running out of options and they can use extra pitchers to help set up a possible playoff rotation.  I expect most of the call ups to come after Toledo's season ends.

Pitchers:

Andrew Oliver: Oliver could make a spot start to juggle the rotation or he could pitch 2, or 3 innings if the starters were given shorter starts if the Division is clinched early.

Lester Oliveros:  The Tigers trusted Oliveros enough to call him up earlier.  His call up seems less likely than some of the others as it might be hard to find work for 12 relief pitchers.  Personally I would fear that Leyland would have Joe-Maddon-moments where he played match up after match up if he had too many pitchers.

Ryan Perry:  This seems obvious.  He might even be able to contribute if his control is better.

Brayan Villarreal:  See Lester Oliveros

Adam Wilk:  Wilk, like Oliver, could eat some innings to help set up a playoff rotation.

Position Players:

Brandon Inge:  The Tigers are paying him no matter what.  Maybe they can use him.  Maybe they promised him he would return.

Will Rhymes:  Carlos Guillen and Ramon Santiago are both are switch hitters.  Guillen plays better offense than Rhymes.  Santiago plays fair defense. I see no reason to call up Rhymes.  I think the Tigers will do it anyway.

Danny Worth:  Worth would supplement Santiago as a defensive replacement in late innings.  Kelly could be used in the outfield if Worth played third.  I'd call up Worth on September 1.

Ryan Strieby:  I honestly don't have a guess.  If I can trust what I found on search engines, Strieby was added to the 40-man roster before the 2009 season.  If so he still has an option left.  The Tigers don't seem to need an extra DH/1B type either.

Clete Thomas:  This might be a long shot.  However, Clete is on his fourth option (yes, fourth- MLB granted an extra due to injuries) and is likely nearly done as a Tiger.

Omir Santos:  Why not?  This would avoid possible using an inexperienced Don Kelly at catcher in a game.