Because he got traded to the Oakland Athletics after all!
Mike Fiers was one of many Major Leaguers put on trade waivers this week and, unsurprisingly, the Oakland Athletics claimed him on Friday. The teams then had 72-hours to work out a trade, or the Tigers could pull Fiers back or let Oakland claim him. The deadline was at 1:30pm today. At 1:28pm according to Lynn Henning), the two teams hammered out a deal.
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A’s claimed Fiers on waivers. Deadline was 1:30 to make deal within 72-hour allowance. Deal was made at 1:28 p.m. Tigers will be picking up two PTBNL — the cash considerations are always part of the rules on such a trade. Protects against guys on the PTBNL list getting injured.
— Lynn G. Henning (@Lynn_Henning) August 6, 2018
The Tigers will select players from a list of prospects the two teams agreed on; if the PTBNLs get hurt the cash can serve as a fallback option.

Mercenary Mike Fiers is on the move. (Photo by Alexandra Simon)
After being removed from the Astros’ postseason roster last year, Fiers has a chance to pitch in the postseason with Oakland.
As for the Tigers, they’ll be recalling former top prospect Jacob Turner (who recently returned to the organization as a minor league free agent) to take Fiers’ next start:
Jacob Turner will return to @MLB with the @Tigers and replace Mike Fiers in the Detroit rotation. This marks his first start for Tigers since 2012, when he was dealt to @Marlins in the Sanchez/Infante trade. @MLBNetwork
— Jon Morosi (@jonmorosi) August 6, 2018
Exciting!