ESPN's Buster Olney reports on Twitter that if the Tigers want to make a deal to land Dan Haren, they will have to send Jacob Turner and Andy Oliver to Arizona.
As mentioned before, Turner is the Tigers' top prospect and a top-30 prospect in all of baseball. He is only 19 years old and obviously has lots of upside and potential. The same goes for Oliver, who started in five games for the Tigers this season. He struggled in his last few starts before being sent down to Toledo, but he did show some promise during his time with Detroit.
It's not clear if the Diamondbacks want only Turner and Oliver for Haren or if they are simply part of a bigger package, but either way the Tigers are going to have to ask themselves this question: Is a proven player like Haren worth getting rid of your top prospect and another promising young pitcher, even if there's no guarantee that they will be good down the road? Part of me says no, but at the same time, it's not like the Tigers would be renting Haren for a couple months. He is under contract for at least two more seasons, so this would be a move for the short term and the future.