Per Jane Lee
RHP Ross Wolf brought up from Sacramento. He was part of the trade that sent Fox to Baltimore. #Athletics
I think it's good that Ross is getting sent down - it will aid in his future development and hopefully he can be succesful as a starter to be relied on in the future.
As for Wolf, apparently he will take over Rooss' place in the bullpen. To make room for him on the 40 man roster Chavez has been placed on the 60 day DL. I don't see why Chavez just doesn't get cut by the team - his salary is a sunk cost and he is done. If he doesn't want to retire the team should make the decision for him.