Greene is 4-6 with a 5.82 ERA in 13 games. He allowed only one run in his first three games but has struggled since.
''Obviously Shane pitched extremely well early, struggled a little bit lately. I think we're hoping it's a situation where he can go back there and regain the form, regain the movement on the sinker, work on the change-up,'' Tigers manager Brad Ausmus said. ''He's got excellent stuff, he's as hard a worker as we've got in the clubhouse. Still think he's got an extremely bright future.''
The Tigers recalled lefthanded pitcher Ian Krol from Toledo to replace Greene on the roster.