With Detroit on an eight-game skid as we go to press this afternoon, the stock call from comfy-chair GMs is for the Tigers to "sell", to trade veterans for younger veterans and start rebuilding for the future.
JD Martinez is the poster boy on this front, a great all-around hitter on the last year of a deal. For a team looking for an edge in the post-season, JD would make a logical "buy", landing a haul loosely on a par with the deals that netted Michael Fulmer for Cespedes or the Boyd and Norris for David Price two years ago. You don't get next year's Rookie of the Year in rent-a-player deals every time, but a serviceable future starter like one of the Price duo would be a minimum asking price.
Other than that, the cupboard is rather bare; here's a list of Tiger salaries and how long their deals are for. Alex Avila, on a one year, $2M deal might be of interest to a team in need of a catcher with a hot left-handed bat, or as a possible DH or NL super-sub/pinch hitter. If his dad isn't interesting in auctioning off Alex, rookie C-1B John Hicks might net a comparable pitching or outfield prospect that could either shore up the bullpen or be JD's successor in right.
Ian Kinsler might interest some teams if they see him picking up his offensive production a tad; his $11m this year with a $10m team option for 2018 might net some interest in the rent-a-player market. If the Tigers want to go into full rebuild mode, they could roll the dice with Dixon Machado at second and get a solid prospect or two for Kinsler, but that would be a real towel-throwing event.
One very outside shot might be Anibal Sanchez, if (yuge if) he pitches the way he pitched last night for a few more starts. He's on a pricy $16.8M deal for 2017, but it's the last guaranteed year; his deal has a $16m team option for 2018, so if the old Anibal keeps rolling into September, his team can keep him for another year, but can cut him loose if he reverts back to 2016 lack-of-form. If he cards a 3.00ERA or so from here through late July, a starter-short pennant contender could come sniffing.
The other veterans aren't all that tradable. Miggy is overpaid for his current production and is slated to make those numbers well into the 2020s. V-Mart would be hard to move as well. Upton and Zimmerman had no-trade clauses.
[Update 12/13/17- Upton must of waived his, as he went, along with Avila, at the trade deadline. Kinsler is being dangled as we speak. Of course, I missed the Verlander trade altogether, as that was throwing in the whole friggin' hamper.]