He was released by the Brewers on August 21 , 2014 .
On December 12 , 2013 , Mattison was selected by the Milwaukee Brewers in the minor league phase of the Rule 5 Draft .
Mattison was released by the Milwaukee Brewers on August 21 , 2014 .
On December 12 , 2013 , Mattison was selected by the Milwaukee Brewers in the minor league phase of the Rule 5 Draft .