Bonderman has proven to be a versatile reliever since returning to Detroit in early August, pitching in situations ranging from long relief to setup work. He has allowed four earned runs on nine hits over 14 1/3 innings, with 10 walks and 12 strikeouts.
Alvarez made a few spot starts but returned to Detroit as a lefty reliever in mid-August while Phil Coke went to Toledo for a week and a half to work on his pitching. Alvarez gives Detroit a third left-hander in the bullpen alongside Coke and Drew Smyly.
Holaday will be the third catcher, behind Alex Avila and Brayan Pena. He spent two weeks as Pena's backup in August while Avila was on the disabled list with a concussion.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. This story was not subject to the approval of Major League Baseball or its clubs.