It isn't for lack of trying, but the Tigers have now spent almost an entire season without an everyday third baseman. Ever since Jace Jung was demoted to Triple-A — and he hasn't gotten a chance again, even though Trey Sweeney's been called up multiple times to cover for injuries, even for outfielders — it's been mostly Zach McKinstry and Colt Keith at the hot corner.
Rumors suggest that the Tigers will get right back on the Alex Bregman train if he opts out of his deal with the Red Sox (which he probably won't), but they also have a lot of internal options.